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Seismicity changes prior to the M s 8.0 Wenchuan earthquake in Sichuan, China
Author(s) -
Huang Qinghua
Publication year - 2008
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl036270
Subject(s) - epicenter , seismology , induced seismicity , geology , aftershock , anomaly (physics) , physics , condensed matter physics
The Region‐Time‐Length (RTL) method was adopted in analyzing the characteristics of the seismicity changes prior to the M s 8.0 Wenchuan earthquake occurred on May 12, 2008. After the pre‐analyses (completeness analysis and aftershock declustering) of the earthquake catalog in China, the RTL parameters in the investigated region were calculated. The temporal variations of the RTL parameters at the epicenter of the M s 8.0 Wenchuan earthquake showed that a seismic quiescence anomaly appeared during 2006–2007. The close investigation indicated that the above quiescence anomaly is unlikely an artifact due to the selections of the model parameters. The investigation of the spatial distribution of seismic quiescence also showed that the quiescence anomaly appeared around the epicenter of the mainshock during 2006–2007, consistent with the results obtained from the temporal variations of the RTL parameters. The above characteristics of the seismicity changes may give better understanding of the seismogenic process of the Wenchuan earthquake.