Search

Your search keyword '"Stipcevic, Josip"' showing total 18 results
Start Over Author "Stipcevic, Josip"
18 results on '"Stipcevic, Josip"'

9. Shear-wave velocity structure beneath the Dinarides from the inversion of Rayleigh-wave dispersion

Author

Belinic, Tena, Kolinsky, Petr, Stipcevic, Josip, Belinic, Tena, Kolinsky, Petr, and Stipcevic, Josip

Abstract

Highlights • Rayleigh-wave phase velocity in the wider Dinarides region using the two-station method. • Uppermost mantle shear-wave velocity model of the Dinarides-Adriatic Sea region. • Velocity model reveals a robust high-velocity anomaly present under the whole Dinarides. • High-velocity anomaly reaches depth of 160 km in the northern Dinarides to more than 200 km under southern Dinarides. • New structural model incorporating delamination as one of the processes controlling the continental collision in the Dinarides. The interaction between the Adriatic microplate (Adria) and Eurasia is the main driving factor in the central Mediterranean tectonics. Their interplay has shaped the geodynamics of the whole region and formed several mountain belts including Alps, Dinarides and Apennines. Among these, Dinarides are the least investigated and little is known about the underlying geodynamic processes. There are numerous open questions about the current state of interaction between Adria and Eurasia under the Dinaric domain. One of the most interesting is the nature of lithospheric underthrusting of Adriatic plate, e.g. length of the slab or varying slab disposition along the orogen. Previous investigations have found a low-velocity zone in the uppermost mantle under the northern-central Dinarides which was interpreted as a slab gap. Conversely, several newer studies have indicated the presence of the continuous slab under the Dinarides with no trace of the low velocity zone. Thus, to investigate the Dinaric mantle structure further, we use regional-to-teleseismic surface-wave records from 98 seismic stations in the wider Dinarides region to create a 3D shear-wave velocity model. More precisely, a two-station method is used to extract Rayleigh-wave phase velocity while tomography and 1D inversion of the phase velocity are employed to map the depth dependent shear-wave velocity. Resulting velocity model reveals a robust high-velocity anomaly present under the whole Dinar

Published
2021
Full Text
View/download PDF

10. Arrival angles of teleseismic fundamental mode Rayleigh waves across the AlpArray

Author

Kolinsky, Petr, Bokelmann, Götz, Hetenyi, Gyorgy, Abreu, Rafael, Allegretti, Ivo, Apoloner, Maria-Theresia, Aubert, Coralie, Besancon, Simon, Bes De Berc, Maxime, Bokelmann, Goetz, Brunel, Didier, Capello, Marco, Carman, Martina, Cavaliere, Adriano, Cheze, Jerome, Chiarabba, Claudio, Clinton, John, Cougoulat, Glenn, Grawford, Wayne C., Cristiano, Luigia, Czifra, Tibor, D'Alema, Ezio, Danesi, Stefania, Daniel, Romuald, Dannowski, Anke, Dasovic, Iva, Deschamps, Anne, Dessa, Jean-Xavier, Doubre, Cecile, Egdorf, Sven, Fiket, Tomislav, Fischer, Kasper, Friederich, Wolfgang, Fuchs, Florian, Funke, Sigward, Giardini, Domenico, Govoni, Aladino, Graczer, Zoltan, Groeschl, Gidera, Heimers, Stefan, Heit, Ben, Herak, Davorka, Herak, Marijan, Huber, Johann, Jaric, Dejan, Jedlicka, Petr, Jia, Yan, Jund, Helene, Kissling, Edi, Klingen, Stefan, Klotz, Bernhard, Kopp, Heidrun, Korn, Michael, Kotek, Josef, Kuhne, Lothar, Kuk, Kreso, Lange, Dietrich, Loos, Jürgen, Lovati, Sara, Malengros, Deny, Margheriti, Lucia, Maron, Christophe, Martin, Xavier, Massa, Marco, Mazzarini, Francesco, Meier, Thomas, Metral, Laurent, Molinari, Irene, Moretti, Milena, Nardi, Anna, Pahor, Jurij, Paul, Anne, Pequegnat, Catherine, Petersen, Daniel, Pesaresi, Damiano, Piccinini, Davide, Piromallo, Claudia, Plenefisch, Thomas, Plomerova, Jaroslava, Pondrelli, Silvia, Prevolnik, Snjezan, Racine, Roman, Regnier, Marc, Reiss, Miriam, Ritter, Joachim, Rumpker, Georg, Salimbeni, Simone, Santulin, Marco, Scherer, Werner, Schippkus, Sven, Schulte-Kortnack, Detlef, Sipka, Vesna, Solarino, Stefano, Spallarossa, Daniele, Spieker, Kathrin, Stipcevic, Josip, Strollo, Angelo, Sule, Balint, Szanyi, Gyongyver, Szucs, Eszter, Thomas, Christine, Thorwart, Martin, Tilmann, Frederik, Ueding, Stefan, Vallocchia, Massimiliano, Vecsey, Ludek, Voigt, Rene, Wassermann, Joachim, Weber, Zoltan, Weidle, Christian, Wesztergom, Viktor, Weyland, Gauthier, Wiemer, Stefan, Wolf, Felix, Wolyniec, David, Zieke, Thomas, Zivcic, Mladen, Zlebcikova, Helena, Institut für Meteorologie und Geophysik [Wien] (IMGW), Universität Wien, Austrian Science Fund (FWF)through project P 26391–AlpArray Austria and P 30707–AlpArrayAustria 2. The Python Toolbox ObsPy by Beyreuther et al. (2010)was used for data pre-processing. Maps were plotted using GenericMapping Tools by Wessel et al. (2013)., and University of Vienna [Vienna]

Subjects
Beamforming, Wave propagation, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Earth structure, engineering.material, 010502 geochemistry & geophysics, 01 natural sciences, symbols.namesake, Geochemistry and Petrology, Time-series analysis, Wave scattering and diffraction, Rayleigh wave, 0105 earth and related environmental sciences, Anomaly (natural sciences), Geodesy, Europe, Geophysics, Phase correlation, symbols, engineering, Structure of the Earth, Surface waves and free oscillations, Geology, Earthquake location, Gaussian beam
Abstract

International audience; The dense AlpArray network allows studying seismic wave propagation with high spatial resolution. Here we introduce an array approach to measure arrival angles of teleseismic Rayleigh waves. The approach combines the advantages of phase correlation as in the two-station method with array beamforming to obtain the phase-velocity vector. 20 earthquakes from the first two years of the AlpArray project are selected, and spatial patterns of arrival-angle deviations across the AlpArray are shown in maps, depending on period and earthquake location. The cause of these intriguing spatial patterns is discussed. A simple wave-propagation modelling example using an isolated anomaly and a Gaussian beam solution suggests that much of the complexity can be explained as a result of wave interference after passing a structural anomaly along the wave paths. This indicates that arrival-angle information constitutes useful additional information on the Earth structure, beyond what is currently used in inversions.

Published
2019

11. The AlpArray seismic network

Author

Hetenyi, Gyorgy, Molinari, Irene, Clinton, John, Bokelmann, Gotz, Bondar, Istvan, Crawford, Wayne C., Dessa, Jean-Xavier, Doubre, Cecile, Friederich, Wolfgang, Fuchs, Florian, Giardini, Domenico, Graczer, Zoltan, Handy, Mark R., Herak, Marijan, Jia, Yan, Kissling, Edi, Kopp, Heidrun, Korn, Michael, Margheriti, Lucia, Meier, Thomas, Mucciarelli, Marco, Paul, Anne, Pesaresi, Damiano, Piromallo, Claudia, Plenefisch, Thomas, Plomerova, Jaroslava, Ritter, Joachim, Rumpker, Georg, Sipka, Vesna, Spallarossa, Daniele, Thomas, Christine, Tilmann, Frederik (Prof.), Wassermann, Joachim, Weber, Michael (Prof. Dr.), Weber, Zoltan, Wesztergom, Viktor, Zivcic, Mladen, Abreu, Rafael, Allegretti, Ivo, Apoloner, Maria-Theresia, Aubert, Coralie, Besancon, Simon, de Berc, Maxime Bes, Brunel, Didier, Capello, Marco, Carman, Martina, Cavaliere, Adriano, Cheze, Jerome, Chiarabba, Claudio, Cougoulat, Glenn, Cristiano, Luigia, Czifra, Tibor, Danesi, Stefania, Daniel, Romuald, Dannowski, Anke, Dasovic, Iva, Deschamps, Anne, Egdorf, Sven, Fiket, Tomislav, Fischer, Kasper, Funke, Sigward, Govoni, Aladino, Groschl, Gidera, Heimers, Stefan, Heit, Ben, Herak, Davorka, Huber, Johann, Jaric, Dejan, Jedlicka, Petr, Jund, Helene, Klingen, Stefan, Klotz, Bernhard, Kolinsky, Petr, Kotek, Josef, Kuhne, Lothar, Kuk, Kreso, Lange, Dietrich, Loos, Jurgen, Lovati, Sara, Malengros, Deny, Maron, Christophe, Martin, Xavier, Massa, Marco, Mazzarini, Francesco, Metral, Laurent, Moretti, Milena, Munzarova, Helena, Nardi, Anna, Pahor, Jurij, Pequegnat, Catherine, Petersen, Florian, Piccinini, Davide, Pondrelli, Silvia, Prevolnik, Snjezan, Racine, Roman, Regnier, Marc, Reiss, Miriam, Salimbeni, Simone, Santulin, Marco, Scherer, Werner, Schippkus, Sven, Schulte-Kortnack, Detlef, Solarino, Stefano, Spieker, Kathrin, Stipcevic, Josip, Strollo, Angelo, Sule, Balint, Szanyi, Gyongyver, Szucs, Eszter, Thorwart, Martin, Ueding, Stefan, Vallocchia, Massimiliano, Vecsey, Ludek, Voigt, Rene, Weidle, Christian, Weyland, Gauthier, Wiemer, Stefan, Wolf, Felix, Wolyniec, David, and Zieke, Thomas

Subjects
ddc:550, Institut für Geowissenschaften
Abstract

The AlpArray programme is a multinational, European consortium to advance our understanding of orogenesis and its relationship to mantle dynamics, plate reorganizations, surface processes and seismic hazard in the Alps-Apennines-Carpathians-Dinarides orogenic system. The AlpArray Seismic Network has been deployed with contributions from 36 institutions from 11 countries to map physical properties of the lithosphere and asthenosphere in 3D and thus to obtain new, high-resolution geophysical images of structures from the surface down to the base of the mantle transition zone. With over 600 broadband stations operated for 2 years, this seismic experiment is one of the largest simultaneously operated seismological networks in the academic domain, employing hexagonal coverage with station spacing at less than 52 km. This dense and regularly spaced experiment is made possible by the coordinated coeval deployment of temporary stations from numerous national pools, including ocean-bottom seismometers, which were funded by different national agencies. They combine with permanent networks, which also required the cooperation of many different operators. Together these stations ultimately fill coverage gaps. Following a short overview of previous large-scale seismological experiments in the Alpine region, we here present the goals, construction, deployment, characteristics and data management of the AlpArray Seismic Network, which will provide data that is expected to be unprecedented in quality to image the complex Alpine mountains at depth.

Published
2018

12. Ambient-noise tomography of the wider Vienna Basin region

Author

Schippkus, Sven, Zigone, Dimitri, Bokelmann, Götz, Hetenyi, György, Abreu, Rafael, Allegretti, Ivo, Apoloner, Maria-Theresia, Aubert, Coralie, Besancon, Simon, Bes de Berc, Maxime, Brunel, Didier, Capello, Marco, Carman, Martina, Cavaliere, Adriano, Cheze, Jerome, Chiarabba, Claudio, Clinton, John, Cougoulat, Glenn, Crawford, Wayne C., Cristiano, Luigia, Czifra, Tibor, D'Alema, Ezio, Danesi, Stefania, Daniel, Romuald, Dannowski, Anke, Dasovic, Iva, Deschamps, Anne, Dessa, Jean-Xavier, Doubre, Cecile, Egdorf, Sven, Fiket, Tomislav, Fischer, Kasper, Friederich, Wolfgang, Fuchs, Florian, Funke, Sigward, Giardini, Domenico, Govoni, Aladino, Graczer, Zoltan, Gröschl, Gidera, Heimers, Stefan, Heit, Ben, Herak, Davorka, Huber, Johann, Jaric, Dejan, Jedlicka, Petr, Jia, Yan, Jund, Helene, Kissling, Edi, Klingen, Stefan, Klotz, Bernhard, Kolinsky, Petr, Kopp, Heidrun, Korn, Michael, Kotek, Josef, Kühne, Lothar, Kuk, Kreso, Lange, Dietrich, Loos, Jürgen, Lovati, Sara, Malengros, Deny, Margheriti, Lucia, Maron, Christophe, Martin, Xavier, Massa, Marco, Mazzarini, Francesco, Meier, Thomas, Metral, Laurent, Molinari, Irene, Moretti, Milena, Munzarova, Helena, Nardi, Anna, Pahor, Jurij, Paul, Anne, Pequegnat, Catherine, Petersen, Daniel, Pesaresi, Damiano, Piccinini, Davide, Piromallo, Claudia, Plenefisch, Thomas, Plomerova, Jaroslava, Pondrelli, Silvia, Prevolnik, Snjezan, Racine, Roman, Regnier, Marc, Reiss, Miriam, Ritter, Joachim, Rümpker, Georg, Salimbeni, Simone, Santulin, Marco, Scherer, Werner, Schulte-Kortnack, Detlef, Sipka, Vesna, Solarino, Stefano, Spallarossa, Daniele, Spieker, Kathrin, Stipcevic, Josip, Strollo, Angelo, Süle, Balint, Szanyi, Gyöngyver, Szücs, Eszter, Thomas, Christine, Thorwart, Martin, Tilmann, Frederik, Ueding, Stefan, Vallocchia, Massimiliano, Vecsey, Ludek, Voigt, Rene, Wassermann, Joachim, Weber, Zoltan, Weidle, Christian, Wesztergom, Viktor, Weyland, Gauthier, Wiemer, Stefan, Wolf, Felix Noah, Wolyniec, David, Zieke, Thomas, Zivcic, Mladen, Institut für Meteorologie und Geophysik [Wien] (IMGW), Universität Wien, Sismologie (IPGS) (IPGS-Sismologie), Institut de physique du globe de Strasbourg (IPGS), and Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010504 meteorology & atmospheric sciences, Seismic noise, Wave propagation, [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph], Seismic interferometry, Fault (geology), Crustal structure, 010502 geochemistry & geophysics, 01 natural sciences, Physics::Geophysics, symbols.namesake, Geochemistry and Petrology, Rayleigh wave, Dispersion (water waves), Crustal imaging, 0105 earth and related environmental sciences, geography, geography.geographical_feature_category, Seismic tomography, Tectonics, Geophysics, symbols, Seismology, Geology
Abstract

International audience; We present a new 3-D shear-velocity model for the top 30 km of the crust in the wider Vienna Basin region based on surface waves extracted from ambient-noise cross-correlations. We use continuous seismic records of 63 broad-band stations of the AlpArray project to retrieve interstation Green's functions from ambient-noise cross-correlations in the period range from 5 to 25 s. From these Green's functions, we measure Rayleigh group traveltimes, utilizing all four components of the cross-correlation tensor, which are associated with Rayleigh waves (ZZ, RR, RZ and ZR), to exploit multiple measurements per station pair. A set of selection criteria is applied to ensure that we use high-quality recordings of fundamental Rayleigh modes. We regionalize the interstation group velocities in a 5 km × 5 km grid with an average path density of ∼20 paths per cell. From the resulting group-velocity maps, we extract local 1-D dispersion curves for each cell and invert all cells independently to retrieve the crustal shear-velocity structure of the study area. The resulting model provides a previously unachieved lateral resolution of seismic velocities in the region of ∼15 km. As major features, we image the Vienna Basin and Little Hungarian Plain as low-velocity anomalies, and the Bohemian Massif with high velocities. The edges of these features are marked with prominent velocity contrasts correlated with faults, such as the Alpine Front and Vienna Basin transfer fault system. The observed structures correlate well with surface geology, gravitational anomalies and the few known crystalline basement depths from boreholes. For depths larger than those reached by boreholes, the new model allows new insight into the complex structure of the Vienna Basin and surrounding areas, including deep low-velocity zones, which we image with previously unachieved detail. This model may be used in the future to interpret the deeper structures and tectonic evolution of the wider Vienna Basin region, evaluate natural resources, model wave propagation and improve earthquake locations, among others.

Published
2018

13. The AlpArray Seismic Network: A Large-Scale European Experiment to Image the Alpine Orogen

Author

Hetenyi, Gyorgy, Molinari, Irene, Clinton, John, Bokelmann, Gotz, Bondar, Istvan, Crawford, Wayne C., Dessa, Jean-xavier, Doubre, Cecile, Friederich, Wolfgang, Fuchs, Florian, Giardini, Domenico, Graczer, Zoltan, Handy, Mark R., Herak, Marijan, Jia, Yan, Kissling, Edi, Kopp, Heidrun, Korn, Michael, Margheriti, Lucia, Meier, Thomas, Mucciarelli, Marco, Paul, Anne, Pesaresi, Damiano, Piromallo, Claudia, Plenefisch, Thomas, Plomerova, Jaroslava, Ritter, Joachim, Rumpker, Georg, Sipka, Vesna, Spallarossa, Daniele, Thomas, Christine, Tilmann, Frederik, Wassermann, Joachim, Weber, Michael, Weber, Zoltan, Wesztergom, Viktor, Zivcic, Mladen, Abreu, Rafael, Allegretti, Ivo, Apoloner, Maria-theresia, Aubert, Coralie, Besancon, Simon, De Berc, Maxime Bes, Brunel, Didier, Capello, Marco, Carman, Martina, Cavaliere, Adriano, Cheze, Jerome, Chiarabba, Claudio, Cougoulat, Glenn, Cristiano, Luigia, Czifra, Tibor, D'Alema, Ezio, Danesi, Stefania, Daniel, Romuald, Dannowski, Anke, Dasovic, Iva, Deschamps, Anne, Egdorf, Sven, Fiket, Tomislav, Fischer, Kasper, Funke, Sigward, Govoni, Aladino, Groschl, Gidera, Heimers, Stefan, Heit, Ben, Herak, Davorka, Huber, Johann, Jaric, Dejan, Jedlicka, Petr, Jund, Helene, Klingen, Stefan, Klotz, Bernhard, Kolinsky, Petr, Kotek, Josef, Kuhne, Lothar, Kuk, Kreso, Lange, Dietrich, Loos, Jurgen, Lovati, Sara, Malengros, Deny, Maron, Christophe, Martin, Xavier, Massa, Marco, Mazzarini, Francesco, Metral, Laurent, Moretti, Milena, Munzarova, Helena, Nardi, Anna, Pahor, Jurij, Pequegnat, Catherine, Petersen, Florian, Piccinini, Davide, Pondrelli, Silvia, Prevolnik, Snjezan, Racine, Roman, Regnier, Marc, Reiss, Miriam, Salimbeni, Simone, Santulin, Marco, Scherer, Werner, Schippkus, Sven, Schulte-kortnack, Detlef, Solarino, Stefano, Spieker, Kathrin, Stipcevic, Josip, Strollo, Angelo, Sule, Balint, Szanyi, Gyongyver, Szucs, Eszter, Thorwart, Martin, Ueding, Stefan, Vallocchia, Massimiliano, Vecsey, Ludek, Voigt, Rene, Weidle, Christian, Weyland, Gauthier, Wiemer, Stefan, Wolf, Felix, Wolyniec, David, Zieke, Thomas, Hetenyi, Gyorgy, Molinari, Irene, Clinton, John, Bokelmann, Gotz, Bondar, Istvan, Crawford, Wayne C., Dessa, Jean-xavier, Doubre, Cecile, Friederich, Wolfgang, Fuchs, Florian, Giardini, Domenico, Graczer, Zoltan, Handy, Mark R., Herak, Marijan, Jia, Yan, Kissling, Edi, Kopp, Heidrun, Korn, Michael, Margheriti, Lucia, Meier, Thomas, Mucciarelli, Marco, Paul, Anne, Pesaresi, Damiano, Piromallo, Claudia, Plenefisch, Thomas, Plomerova, Jaroslava, Ritter, Joachim, Rumpker, Georg, Sipka, Vesna, Spallarossa, Daniele, Thomas, Christine, Tilmann, Frederik, Wassermann, Joachim, Weber, Michael, Weber, Zoltan, Wesztergom, Viktor, Zivcic, Mladen, Abreu, Rafael, Allegretti, Ivo, Apoloner, Maria-theresia, Aubert, Coralie, Besancon, Simon, De Berc, Maxime Bes, Brunel, Didier, Capello, Marco, Carman, Martina, Cavaliere, Adriano, Cheze, Jerome, Chiarabba, Claudio, Cougoulat, Glenn, Cristiano, Luigia, Czifra, Tibor, D'Alema, Ezio, Danesi, Stefania, Daniel, Romuald, Dannowski, Anke, Dasovic, Iva, Deschamps, Anne, Egdorf, Sven, Fiket, Tomislav, Fischer, Kasper, Funke, Sigward, Govoni, Aladino, Groschl, Gidera, Heimers, Stefan, Heit, Ben, Herak, Davorka, Huber, Johann, Jaric, Dejan, Jedlicka, Petr, Jund, Helene, Klingen, Stefan, Klotz, Bernhard, Kolinsky, Petr, Kotek, Josef, Kuhne, Lothar, Kuk, Kreso, Lange, Dietrich, Loos, Jurgen, Lovati, Sara, Malengros, Deny, Maron, Christophe, Martin, Xavier, Massa, Marco, Mazzarini, Francesco, Metral, Laurent, Moretti, Milena, Munzarova, Helena, Nardi, Anna, Pahor, Jurij, Pequegnat, Catherine, Petersen, Florian, Piccinini, Davide, Pondrelli, Silvia, Prevolnik, Snjezan, Racine, Roman, Regnier, Marc, Reiss, Miriam, Salimbeni, Simone, Santulin, Marco, Scherer, Werner, Schippkus, Sven, Schulte-kortnack, Detlef, Solarino, Stefano, Spieker, Kathrin, Stipcevic, Josip, Strollo, Angelo, Sule, Balint, Szanyi, Gyongyver, Szucs, Eszter, Thorwart, Martin, Ueding, Stefan, Vallocchia, Massimiliano, Vecsey, Ludek, Voigt, Rene, Weidle, Christian, Weyland, Gauthier, Wiemer, Stefan, Wolf, Felix, Wolyniec, David, and Zieke, Thomas

Abstract

The AlpArray programme is a multinational, European consortium to advance our understanding of orogenesis and its relationship to mantle dynamics, plate reorganizations, surface processes and seismic hazard in the Alps-Apennines-Carpathians-Dinarides orogenic system. The AlpArray Seismic Network has been deployed with contributions from 36 institutions from 11 countries to map physical properties of the lithosphere and asthenosphere in 3D and thus to obtain new, high-resolution geophysical images of structures from the surface down to the base of the mantle transition zone. With over 600 broadband stations operated for 2 years, this seismic experiment is one of the largest simultaneously operated seismological networks in the academic domain, employing hexagonal coverage with station spacing at less than 52 km. This dense and regularly spaced experiment is made possible by the coordinated coeval deployment of temporary stations from numerous national pools, including ocean-bottom seismometers, which were funded by different national agencies. They combine with permanent networks, which also required the cooperation of many different operators. Together these stations ultimately fill coverage gaps. Following a short overview of previous large-scale seismological experiments in the Alpine region, we here present the goals, construction, deployment, characteristics and data management of the AlpArray Seismic Network, which will provide data that is expected to be unprecedented in quality to image the complex Alpine mountains at depth.

Published
2018
Full Text
View/download PDF

14. Direct-seismogram inversion for receiver-side structure with unknown source-time functions

Author

Dettmer, Jan, Dosso, Stan E., Bodin, Thomas, Stipcevic, Josip, and Cummins, Phil R.

Subjects
Body waves, Theory, Tomography
Abstract

This work presents direct-seismogram inversion for receiver-side structure which treats the source signal incident from below (the effective source-time function, STF) as a vector of unknown parameters in a Bayesian framework. As a result, direct-seismogram inversion does not require deconvolution by observed seismogram components as typically applied in receiver-function inversion, and avoids the problematic issue of choosing subjective tuning parameters in the deconvolution. This results in more meaningful inversion results and uncertainty estimation (compared to classic receiver function inversion). A rigorous likelihood function is derived for unbiased inversion results and the STF is efficiently inferred by a maximum-likelihood closed form expression that does not require deconvolution by noisy waveforms. Rather, deconvolution is only by predicted impulse responses for the unknown environment. For a given realization of the parameter vector which describes the medium below the station, data predictions are computed as the convolution of the impulse response and the maximum-likelihood source estimate for that medium. Therefore, the assumption of a Gaussian pulse with specified parameters, typical for the prediction of receiver functions, is not required. Directly inverting seismogram components has important consequences for the noise on the data. Since the signal processing does not require filtering and deconvolution, data errors (including measurement and theory errors) appear to be less correlated and more straightforward to model than those for receiver functions. The direct- seismogram inversion is demonstrated for simulated waveforms and applied to teleseismic data recorded for station Hyderabad on the Indian craton.

Published
2015

15. Spiral-arm seismic arrays

Author

Kennett, Brian, Stipcevic, Josip, Gorbatov, Alexei, Kennett, Brian, Stipcevic, Josip, and Gorbatov, Alexei

Abstract

Seismic arrays havemany uses for signal enhancement, from surface-wave characterization of the near surface to teleseismic detection in the context of monitoring nuclear tests. Many variants of the geometrical configuration of stations have been used with the objective of maximizing potential resolution of the incoming wavefronts direction of arrival. Aversatile class of array configurations, with good resolution properties, can be constructed with multiple spiral arms. The array response is comparablewith the same number of full circles, but with far fewer stations and is robust to minor position changes in emplacement. The desirable properties of the spiral-arm arrays are illustrated for a permanent array in the Precambrian Pilbara craton in northwestern Australia and for a temporary array on ancient sediments in southern Queensland, Australia. In each case, the practical array response is very good and matches the theoretical expectations. The spiral-arm configuration allows the deployment of relatively large aperture arrays with a limited number of stations, which is advantageous in a broad range of seismic applications, including near-surface characterization.

Published
2015

16. Crustal and uppermost mantle structure beneath the External Dinarides, Croatia, determined from teleseismic receiver functions

Author

Stipcevic, Josip, Tkalcic, Hrvoje, Herak , Marijan, Markusic, Snjezana, Herak, Davorka, Stipcevic, Josip, Tkalcic, Hrvoje, Herak , Marijan, Markusic, Snjezana, and Herak, Davorka

Abstract

Broad-band seismograms of teleseismic events recorded at the Croatian Seismological Network were used to compute radial receiver functions (RFs) for eight locations in the External Dinarides. Waveform modelling was performed by a multistep matching of the theoretical RFs computed for horizontally layered 1-D isotropic models with the averaged observed RFs. Constraints from existing deep seismic sounding profiles, traveltime curves of regional crustal seismic phases and intuitive inferences gained from interactive forward modelling were used to construct initial 1-D models of the Earth. A non-linear inversion was performed in two steps-a grid search followed by the Monte Carlo search for the model parameters. Concurrently, RFs from different azimuths were stacked to obtain trade-off estimates of crustal thickness versus Vp/Vs ratios. The Moho depths were found in the range from around 40 km for Northern Adriatic stations to over 55 km for stations in the central part of the External Dinarides. Comparing our results with recent maps of the Moho topography inferred from seismic and gravimetric data, we find that for some stations the agreement between our results and the existing Moho maps is very good. For the others, we find the Mohorovičić discontinuity to be considerably deeper, indicating some of the thickest crust in Europe. Although it is plausible that such a deep Moho could be a consequence of a complex tectonic setting of the region (e.g. overlapping of two large tectonic units-the Adriatic microplate and the Dinarides), this result will have to be verified in the future studies using various other geophysical techniques.

Published
2011

17. New Moho depth map for the wider Dinarides region.

Author

Stipcevic, Josip, Herak, Marijan, Molinari, Irene, and Dasovic, Iva

Subjects
*MOHOROVICIC discontinuity, *GEOPHYSICS
Abstract

\documentclass[a4paper,12pt]{article}% \usepackage{times,fancyhdr}\pagestyle{empty} %\topmargin=-0.0cm\headheight=0.0cm\headsep=0.0cm\oddsidemargin=-0.14cm\textwidth=16cm\textheight=24cm\parindent=0.5cm\parskip=12pt\begin{document}\begin{center}{\large{\bf New Moho depth map for the wider Dinarides region}} \\\vspace{0.3cm}\underline{Josip Stip\v{c}evi\'c$^{1}$}, Marijan Herak$^{1}$, Irene Molinari$^{2}$ and Iva Dasovi\'c$^{1}${\footnotesize$^{1}$Department of Geophysics, University of Zagreb, Zagreb, Croatia\\(jstipcevic@gfz.hr)\\$^{2}$Istituto Nazionale di Geofisica e Vulcanologia, Bologna, Italy\\}\end{center}We present a new crustal thickness map for the wider Dinarides region. The map was constructed from the results of receiver function analyses on more than 90 seismic stations installed in this area, including the newly available AlpArray stations. Moho depth was measured using two methods, simple $H-\kappa$ stacking and a more complex inversion process based on the neighbourhood algorithm. In the first instance, a simple one layered crust was assumed whereas in the second process a two or three layered crust with the addition of the dipping Moho discontinuity was modelled.The results show thicker crust ($> 40$ km) stretching under most of the External Dinarides and slightly thinning towards the Adriatic Sea. It is interesting that the results show a significant crustal thickening in the direction of the Panonnian basin with an abrupt change to relatively thinner crust ($40$ km) in the area of the central Dalmatian archipelago, as compared to the values of less than $35$ km reported in this area in all previous studies. \end{document} [ABSTRACT FROM AUTHOR]

Published
2019

Catalog

Books, media, physical & digital resources
See catalog results