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This paper uses various channels to collect the data of earthquake disasters in 2022, and collates the global seismic activities and earthquake disasters in 2022. The change curves of global disaster earthquake frequency and casualties in recent 20 years and the distribution map of disaster earthquakes in 2022 were drawn. By summarizing the earthquake information and disaster conditions causing casualties, a detailed analysis of major earthquake disasters was made. The main characteristics of global earthquake disasters in 2022 were summarized, and major earthquake events in Afghanistan were listed. Compared with last year’s earthquake, the number of casualties caused by earthquake disasters in 2022 has decreased, and the disaster earthquakes are characterized by concentrated casualties and frequent secondary disasters. In view of the prominent causes of earthquake casualties, this paper puts forward corresponding earthquake disaster prevention measures and suggestions.

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Based on the earthquake disaster data collected by various routes, this paper sorts out the global seismic activity and disasters in 2021. Variation curves of global disaster earthquake frequency with casualties in this century at the beginning twenty years and distribution map of hazard earthquakes in 2021 were plotted. And the earthquake information and disaster situation of earthquakes with casualties were described. Correspondingly, the major earthquake disasters were analyzed in detail, and the main characteristics of global earthquake disasters in 2021 were summarized. Compared with the previous earthquake, it is found that the seismicity is strong in 2021, especially to the occurrence rate of earthquakes with magnitude 8 and above. In 2021, the number of casualties caused by earthquake increased, and disaster earthquakes were characterized by high frequency, concentrated casualties, and frequent secondary disasters. According to the situation of high earthquake frequency and prominent causes of casualties, this paper puts forward corresponding measures and suggestions for earthquake disaster prevention, which emphasizes the importance of earthquake prevention work for the future.

Based on the earthquake disaster data collected worldwide，this paper sorts out the global seismic activity and disasters in 2020. Plotting the global earthquake disaster curves in recent 20 years and distribution map of hazard earthquakes in 2020，and summarizing the main characteristics of seismic disasters which contain earthquake disaster information and detailed analysis in 2020. Compared with the previous global earthquakes，it is found that the seismicity in 2020 is weak，and the frequency of strong earthquakes with magnitude 6 or above will decrease greatly. In 2020，the earthquake casualties are the lowest in this century，and characterized by low frequency，minor casualties and linear distribution of major disasters. According to the situation of low earthquake frequency and concentrated casualties，this paper puts forward corresponding measures and suggestions for earthquake disaster prevention，which emphasizes that the earthquake monitoring，prediction and prevention work are crucial to the future.

Based on the earthquake disaster data collected from different sources, this paper sorts out the global seismic activities and disasters in 2019. Plotting the distribution map of the hazard earthquakes, describing the earthquake information and disaster situation of earthquakes with casualties. Accordingly, making a detailed description and performs analysis for the major earthquake disaster events, and summarizing the main characteristics of earthquake disasters. Compared with the previous earthquakes, it is found that the seismicity is weak in 2019, and the occurrence rate of strong earthquake is greatly reduced. In 2019, the earthquake disasters are characterized by a small number of casualties, but high frequency and wide range. According to this situation, this paper puts forward corresponding measures and suggestions for earthquake disaster prevention, which emphasizes that the future earthquake prediction and prevention work are still important and urgent.

Earthquakes exhibit clear clustering on the earth. It is important to explore the spatial-temporal characteristics of seismicity clusters and their spatial heterogeneity. We analyze effects of plate space, tectonic style, and their interaction on characteristic of cluster. Based on data of earthquakes not less than moment magnitude (MW) 5.6 from 1960 to 2014, this study used the spatial-temporal scan method to identify earthquake clusters. The results indicate that seismic spatial-temporal clusters can be classified into two types based on duration: persistent clusters and burst clusters. Finally, we analysed the spatial heterogeneity of the two types. The main conclusions are as follows: 1) Ninety percent of the persistent clusters last for 22–38 yr and show a high clustering likelihood; ninety percent of the burst clusters last for 1–1.78 yr and show a high relative risk. 2) The persistent clusters are mainly distributed in interplate zones, especially along the western margin of the Pacific Ocean. The burst clusters are distributed in both intraplate and interplate zones, slightly concentrated in the India-Eurasia interaction zone. 3) For the persistent type, plate interaction plays an important role in the distribution of the clusters' likelihood and relative risk. In addition, the tectonic style further enhances the spatial heterogeneity. 4) For the burst type, neither plate activity nor tectonic style has an obvious effect on the distribution of the clusters' likelihood and relative risk. Nevertheless, interaction between these two spatial factors enhances the spatial heterogeneity, especially in terms of relative risk. [ABSTRACT FROM AUTHOR]