The role of the west-dipping collision boundary fault in the Taiwan 2022 Chihshang earthquake sequence.

ABSTRACT: On 17-18 September 2022, an earthquake sequence with a moment magnitude of 6.6 foreshock and a 7.0 mainshock occurred in southeast Taiwan along the Longitudinal Valley. Several surface breaks and collapsed buildings were observed after the event and one person died. The focal mechanisms of the foreshock and mainshock both had a west-dipping fault plane, which is different from the known active east-dipping boundary fault between the Eurasian Plate and the Philippine Sea Plate. Joint source inversions were performed to better understand the rupture mechanism of this earthquake sequence. The results show that the ruptures mainly occurred on a west-dipping fault. In the mainshock, the slip originated from the hypocenter and propagated toward the north with a rupture velocity of approximately

SUBMITTER: Lee SJ 

PROVIDER: S-EPMC9981749 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature