Inversion of current locking degree and slip deficit of fault zone in northern Qaidam Basin based on GPS data

doi:10.11947/j.AGCS.2023.20220714

Abstract

Abstract: The fault zone in northern Qaidam Basin is an essential geological boundary of the northeastern margin of the Qinghai-Tibet Plateau, and its geometry is complex. At present, there are few studies on the current locking degree and slip deficit of regional integral faults. In this paper, a dense regional GPS data is collected and fused, and a geometric model including the Saishiteng-Lüliangshan fault section, Xitieshan-Amunikeshan-Maoniushan fault section, the northern Elashan fault section, the southern Elashan fault section, and the Akesai-Delingha block, the Qaidam block and the Elashan block is established. The negative dislocation model is used to invert the current locking degree and slip deficit of the fault zone in northern Qaidam Basin. The results show that the locking degree and slip deficit of the Saishiteng-Lüliangshan fault section gradually decrease from the central (the average locking coefficient within 15 km depth is about 0.7) to both ends. The locking degree and slip deficit of Xitieshan-Amunikeshan-Maoniushan fault section increase gradually from northwest to southeast. The average locking coefficient within 15 km depth in the central and southeast parts is about 0.99, and the average slip deficits are about 3.34 mm/a and 3.80 mm/a, respectively. The locking depth of the northern most part of the northern Elashan fault section is shallow, the locking depth of the central and southern parts is deep (about 19 km), and the slip deficit of central part is enormous. The locking depth at both ends of the southern Elashan fault section is up to 20 km (the average locking coefficients within 15 km depth are about 0.9 and 0.99, respectively), the locking depth of central part is shallow, and the slip deficit of northern part is enormous. Based on the comprehensive inversion results and the analysis of historical seismic distribution, the seismic risk of central and southeastern parts of Xitieshan-Amunikeshan-Maoniushan fault section, the central part of northern Elashan fault section, and the northern part of southern Elashan fault section may be high, which should be paid attention to.

Key words: the fault zone in northern Qaidam Basin, GPS, negative dislocation model, locking degree, slip deficit

CLC Number:

P228

LIU Yang, QIU Yuxuan, WANG Junyi, LI Hanghao, ZHANG Yu, WEN Yangmao, XU Caijun. Inversion of current locking degree and slip deficit of fault zone in northern Qaidam Basin based on GPS data[J]. Acta Geodaetica et Cartographica Sinica, 2023, 52(12): 2015-2027.

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