A Possible Tectonic Response Between the Qingchuan Faultand the Beichuan‐Yingxiu Fault of the Longmen Shan Fault Zone? Evidence From Geologic Observations by Paleoseismic Trenching and Radiocarbon Dating
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Abstract The Qingchuan fault is located along the eastern margin of the Tibetan Plateau and connects to the Beichuan‐Yingxiu fault of the Longmen Shan fault zone (LMSF), which produced the 2008 MW 7.9 Wenchuan earthquake and 2013 MW6.6 Lushan earthquake. After the two devastating earthquakes, whether the Qingchuan fault could produce a large earthquake or not and its tectonic activity is highly debated. Based on the detailed field investigations and paleoseismic trenching combined with multiple radiocarbon dating, we suggest that the Qingchuan fault might not show intense fault activity (or specific dextral strike‐slip deformation) since the late Quaternary. The deformation evidence revealed in the trench indicates a pattern of tensional deformation in the strata, which is inconsistent with the regional compressional tectonic stress field. Moreover, the timing of these deformation events coincides with that of paleoearthquakes that occurred on the Beichuan‐Yingxiu fault. Therefore, we speculate that the large earthquakes that occurred on the northern segment of the Beichuan‐Yingxiu fault highly likely contribute to the formation of the tensional structures observed along the Qingchuan fault. The uplift of the Minshan Mountain affects the tectonic deformation and seismic activity of the northern segment of the LMSF. However, considering that the LMSF shows forward‐thrust characteristics, the fault activity of the Qingchuan fault was possibly the most affected by the uplifting of the Minshan Mountain. In other words, this specific regional tectonic frame might constrain the buildup of tectonic stress and seismic potential for generating large earthquakes on the Qingchuan fault.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- A Possible Tectonic Response Between the Qingchuan Faultand the Beichuan‐Yingxiu Fault of the Longmen Shan Fault Zone? Evidence From Geologic Observations by Paleoseismic Trenching and Radiocarbon Dating
- Date Crossref
- 01/10/2018
- Éditeur
- American Geophysical Union (AGU)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Heilongjiang Earthquake Agency pays non établi dans la noticeOrganisme public
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Institute of Geology pays non établi dans la noticeStructure de recherche
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China Earthquake Administration pays non établi dans la noticeStructure de recherche
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Southwest Jiaotong University pays non établi dans la noticeUniversité ou école supérieure
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Sichuan Earthquake Agency Chengdu China pays non établi dans la noticeOrganisme public
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State Key Laboratory of Earthquake Dynamics pays non établi dans la noticeStructure de recherche
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Faculty of Geosciences and Environmental Engineering pays non établi dans la noticeUniversité ou école supérieure
Heilongjiang Earthquake Agency, Institute of Geology et China Earthquake Administration, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.