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Finite Fault Inversion for M6.8 Luding Earthquake: Impact of Station Configuration on Inversion Robustness

Description: 

A strike-slip earthquake of M6.8 occurred in Luding County, Sichuan Province, China (102.08°E, 29.59°N), on September 5, 2022, with a focal depth of 16 km. The numerous strong-motion stations have provided valuable near-field observation data. Finite fault inversion is widely used to recover complex features of the rupture evolution. However, station configuration has impact on the stability of inversion results. In this paper, we applied the finite fault inversion to strong motion data of Luding earthquake, and the impact of station configuration was also explored. We found that the rupture process can be divided into two episodes. In the first episode, the initial rupture lasted for 3 second on a westward tilting fault plane. In the next episode, a shallow rupture started after the previous rupture and lasted for 4 second. As a result, the 2022 Luding earthquake failed to cascade up to a lager event. For the influence of stations configuration, the inversion using more stations provided more reliable models, but the waveforms of remote stations (epicenter distance > 200km) did not match well and contributed little information to the fault rupture. The azimuth angles of stations also affected the inversion results significantly due to the complex variations of tectonic environment from the east to the west of Sichuan Province. To gain reliable information during the inversion, an optimal station network needs to be automatically designed for robust finite fault inversion.

Session: From Earthquakes to Plate Boundaries: Insights Into Fault Behavior Spanning Seconds to Millennia [Poster]

Type: Poster

Date: 4/20/2023

Presentation Time: 08:00 AM (local time)

Presenting Author: Peng Wu

Student Presenter: Yes

Invited Presentation: 

Authors