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Aftershock monitoring and subsurface imaging with DAS array for the 2022 Menyuan Ms6.9 earthquake, China

Authors

Zeng,  Xiangfang
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bao,  Feng
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lv,  Hao
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Wang,  Song
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Zhang,  Gongbo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chi,  Benxin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Zeng, X., Bao, F., Lv, H., Wang, S., Zhang, G., Chi, B. (2023): Aftershock monitoring and subsurface imaging with DAS array for the 2022 Menyuan Ms6.9 earthquake, China, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3699


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020844
Abstract
An Ms6.9 earthquake occurred in Menyuan, Qinghai, China on Jan 7th, 2022. This earthquake destructed the high-speed railway passing through the epicentral area and rise concerns on the seismic hazard of the Tianzhu Seismic gap, which is about 150 km long. Two DAS arrays were deployed with about 40km long dark fiber optic cable for aftershock monitoring and subsurface imaging. Three automatic methods were utilized to scan earthquake signals on the continuous data including: a neural network, template-matching method, and a hybrid method integrating array-detection and template-matching. All of three methods reported more than 80% aftershocks in the routine catalog and up to 50% newly detected events. For the template-matching method, using aftershocks occurred in the first two-day as templates provides about 91% catalog events and 50% additional events. The other two methods do not depend on the prior information, which means quicker response. The fault-related signal is also observed on the seismic wavefields of earthquakes, which helps to identify blind faults in the Menyuan basin. Ambient noise tomography method was used to construct 2D Vs profile along one cable. Strong lateral variation emerges and faults can be identified on the NCF COG gather. Such high-resolution shallow structure model and earthquake catalog provides additional information of seismic hazard in the Menyuan region.