CRUSTAL STRESS FIELD AND ITS TECTONIC SIGNIFICANCE NEAR THE LONGMENSHAN FAULT BELT, AFTER THE WENCHUAN <i>M</i>s8.0 EARTHQUAKE

FENG Chengjun; QI Bangshen; ZHANG Peng; SUN Dongsheng; MENG Jing; NIU Linlin; WANG Miaomiao; TAN Chengxuan; CHEN Qunce

doi:10.12090/j.issn.1006-6616.2018.24.04.046

Volume 24 Issue 4

Aug. 2018

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Article Navigation > Journal of Geomechanics > 2018 > 24(4): 439-451

FENG Chengjun, QI Bangshen, ZHANG Peng, et al., 2018. CRUSTAL STRESS FIELD AND ITS TECTONIC SIGNIFICANCE NEAR THE LONGMENSHAN FAULT BELT, AFTER THE WENCHUAN Ms8.0 EARTHQUAKE. Journal of Geomechanics, 24 (4): 439-451. DOI: 10.12090/j.issn.1006-6616.2018.24.04.046

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CRUSTAL STRESS FIELD AND ITS TECTONIC SIGNIFICANCE NEAR THE LONGMENSHAN FAULT BELT, AFTER THE WENCHUAN Ms8.0 EARTHQUAKE

doi: 10.12090/j.issn.1006-6616.2018.24.04.046

FENG Chengjun^{1, 2
,},
QI Bangshen³,
ZHANG Peng^{1, 2},
SUN Dongsheng^{1, 2},
MENG Jing^{1, 2},
NIU Linlin¹,
WANG Miaomiao¹,
TAN Chengxuan^{1, 2},
CHEN Qunce^{1, 2}

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Key Laboratory of Neo-tectonic Movement & Geo-hazard, Ministry of Land and Resources, Beijing 100081, China
3.
Beijing Institute of Geo-exploration Technology, Beijing 100120, China

More Information

Received: 2018-03-20
Revised: 2018-05-28
Published: 2018-08-01

Abstract

Abstract

The great Wenchuan Ms8.0 earthquake of May 12, 2008 occurred on the central segment of the Longmenshan Fault Belt. Stress was released when the earthquake struck and stress field of seismic source and peripheral areas were affected. Due to the spatial difference in rapture mode and intensity of fault in the Wenchuan earthquake, the crustal stress field in the Longmenshan Fault Belt should also show various features after the earthquake. So far, there have been few in-depth analysis and discussion on this scientific problem. In this study, the hydraulic fracturing in situ stress measurement data along the Longmenshan Fault Belt as well as the focal mechanism solutions of the strong aftershocks sequences after the Wenchuan earthquake are collected and analyzed, and the mid-upper crustal tectonic stress field of the Longmenshan Fault Belt is determined. The influences of the Wenchuan earthquake on the crustal tectonic stress field are thoroughly discussed through comparing with the regional tectonic stress before the great earthquake, which provides a scientific reference for understanding the stress adjustment process after the Wenchuan earthquake and the deep structural deformation model of the Longmenshan area on the eastern margin of Qinghai-Tibet Plateau. The results reveal that some distributional diversity of the crustal tectonic stress field does exist. At the depth of 0~15 km, the maximum principal stress is orientated at NWW near the Yingxiu-Qingchuan segment of the Lonmenshan Fault Belt and the stress state is characterized by TS, whereas, it is NEE with the SS stress regime at the northeastern Qingchuan area. At the depth of 15~25 km, the principal compressive stress is still orientated at NW~NWW with the broad stress state of TT, which is consistent with the regional tectonic stress field before the Wenchuan earthquake. The NWW-trending compression tectonic stress field beneath the middle crust of the Longmenshan Fault Belt further supports the rigid collision tectonic deformation in the Longmenshan area with collision-compression and thrust-nappe structures.
- Longmenshan Fault Belt,
- Wenchuan Ms8.0 earthquake,
- tectonic stress field,
- focal mechanism solution,
- in situ stress

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CRUSTAL STRESS FIELD AND ITS TECTONIC SIGNIFICANCE NEAR THE LONGMENSHAN FAULT BELT, AFTER THE WENCHUAN Ms8.0 EARTHQUAKE

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CRUSTAL STRESS FIELD AND ITS TECTONIC SIGNIFICANCE NEAR THE LONGMENSHAN FAULT BELT, AFTER THE WENCHUAN Ms8.0 EARTHQUAKE

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