Long-term temperature records following the Mw 7.9 Wenchuan (China) earthquake are consistent with low friction

Haibing Li, Lian Xue, Emily E. Brodsky, James J. Mori, Patrick M. Fulton, Huan Wang, Yasuyuki Kano, Kun Yun, Robert N. Harris, Zheng Gong, Chenglong Li, Jialiang Si, Zhiming Sun, Junling Pei, Yong Zheng, Zhiqin Xu

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Knowledge of the shear stress on a fault during slip is necessary for a physically-based understanding of earthquakes. Borehole temperature measurements inside the fault zone immediately after an earthquake can record the energy dissipated by this stress. In the first Wenchuan Earthquake Fault Zone Scientific Drilling Project hole (Sichuan province, China) we repeatedly measured temperature profiles from 1.3 to 5.3 yr after the 12 May 2008, Mw 7.9 Wenchuan earthquake. The previously identified candidate for the principal slip surface had only a small local temperature increase of at most 0.02 °C with no obvious decay. The small amplitude of the temperature increase provides an upper bound for the frictional heat-generated coseismic slip, but is unlikely to be a frictionally generated signal. Two larger temperature anomalies are located above and within the fault zone. However, neither anomaly evolves as expected from a frictional transient. We conclude that the frictional heat from the Wenchuan earthquake remains elusive and the total heat generated at this location is much less than 29 MJ/m2. Low friction during slip is consistent with the temperature data.

Original languageEnglish
Pages (from-to)163-166
Number of pages4
JournalGeology
Volume43
Issue number2
DOIs
Publication statusPublished - Feb 2015
Externally publishedYes

Fingerprint Dive into the research topics of 'Long-term temperature records following the M<sub>w</sub> 7.9 Wenchuan (China) earthquake are consistent with low friction'. Together they form a unique fingerprint.

Cite this