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On April 3, 2024, at 07:58 (Beijing time), a magnitude 7.3 earthquake occurred in the waters of Hualien County, Taiwan Province. The Institute of Geophysics, China Earthquake Administration initiated a rapid response after the earthquake and organized geophysics researchers to estimate the source model and seismic radiation energy of the earthquake. Based on the source model, the shakemap and coseismic deformation field simulation were carried out. The results indicate that the earthquake occurred at the boundary between the Philippine Sea Plate and the Eurasian Plate, primarily characterized by a thrust mechanism, with energy released predominantly in the first 35 seconds. The earthquake intensity in the extreme seismic area possibly have reached more than X degree, with a potential disaster area of approximately 35000 km2. The earthquake also caused significant coseismic displacements, with the maximum horizontal displacement reaching 0.52 m and the vertical displacement reaching 1.18 m.

Copyright of Progress in Earthquake Sciences is the property of China Earthquake Administration, Institute of Geophysics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

On January 23，2024 at 02:09 (Beijing time), the MS7.1 earthquake occurred in Wushi county, Aksu Prefecture, Xinjiang. The Institute of Geophysics, China Earthquake Administration initiated a rapid response after the earthquake, organized researchers in related fields to estimate the source parameters, seismic radiation energy, and repositioned the aftershock sequence. At the same time, seismic map simulation and co-seismic deformation field simulation were carried out based on the source model. The results indicate that the earthquake occurred within the Tianshan Mountains, mainly through a thrust mechanism, with energy concentrated and released within the first 25 seconds; The seismic intensity in the extreme earthquake zone may reach over Ⅸ degrees, with a possible disaster area of nearly 65000 km2; This earthquake caused significant coseismic displacement, with a maximum horizontal displacement of 21 cm and a vertical displacement of 38 cm.

At 22:37 on December 2, 2023 (Beijing time), a M7.6 earthquake occurred in the eastern waters of Mindanao，Philippines. The Institute of Geophysics, China Earthquake Administration initiated the response mechanism after this earthquake and organized geophysics researchers to estimate the source parameters, focal mechanism，rupture process and earthquake radiation energy of this earthquake. Based on the source model, the Shakemap and the coseismic deformation field simulation are carried out. Product results demonstrate that this earthquake occurred on the subduction zone slab where the Philippine Sea Plate collided with the Eurasian Plate/Sunda Block. This earthquake is of dominant thrusting mechanism. The energy was concentrated and released in the first 40 seconds. The maximum slip of the fault rupture is up to 7 m. The efficiency of the earthquake source in radiating seismic energy is low and the slowness coefficient is slightly lower than the average level of the global same moment magnitude earthquake, and the feeling of the earthquake is relatively weak. The earthquake intensity in the extreme seismic area possibly reaches more than Ⅸ, and the approximate disaster range is up to 27000 km2. This earthquake caused apparent coseismic displacement with the maximum displacements reaching 0.6 m and 1.2 m in the horizontal and vertical directions respectively. Comprehensive analysis shows that this earthquake can’t produce a large-scale tsunami.

At 23:59 on December 18, 2023 (Beijing time), a M6.2 earthquake occurred in the Gansu Province of Jishishan. The Institute of Geophysics，China Earthquake Administration initiated the response mechanism after this earthquake and organized geophysics researchers to estimate the source parameters, focal mechanism, rupture process, earthquake radiation energy and earthquake relocation of this earthquake. Based on the source model, the Shakemap and the coseismic deformation field simulation are carried out. The results demonstrate that the earthquake is of dominant thrusting mechanism. The energy was concentrated and released in the first 8 seconds. The earthquake intensity in the extreme seismic area possibly exceeded Ⅷ, resulting in an estimated disaster range of approximately 6000 km2. This earthquake caused apparent horizontal coseismic displacement with maximum displacements reaching 7.8 cm and 15.8 cm.

Copyright of Progress in Earthquake Sciences is the property of China Earthquake Administration, Institute of Geophysics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Progress in Earthquake Sciences is the property of China Earthquake Administration, Institute of Geophysics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Progress in Earthquake Sciences is the property of China Earthquake Administration, Institute of Geophysics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)