The 28 March 2019 Mw 5.04 Mangya earthquake damaged eight ongoing drilling boreholes in the oil‐production Yingxiong Ling (YXL) area, southwestern Qaidam of northern Tibet. The borehole damages provide an opportunity to measure directly the coseismic slips, the rupture area, and the seismic moment. The damages reveal the underground rupture area of 45.30 ± 10.24 km², the maximum slip of 400 ± 13 mm, and the seismogenic fault dip of ~38.6°. These parameters generate a seismic moment of (1.81 ± 0.47) × 10¹⁷ Nm and a moment magnitude of 5.47 ± 0.16. Seismic exploration reveals that the geometry of the SZG ramp, the uppermost part of the multibend Yingxiong Ling thrust system, agrees primarily with the rupture plane derived from the borehole damages and one plane of the focal mechanism solution. This suggests that this earthquake resulted from slipping on the ramp. The hanging wall of the YXL thrust system forms the complex fault‐bend fold YXL anticlinorium. Active thrusting and folding along both edges of YXL attest to the southwestern vergence of this thrust system. Growth strata demonstrate average slip rates of the thrust system ranging from ~0.2 to ~0.3 mm/yr. The thrusted and folded recent alluviums along the southwestern edge indicate two thrusting events with coseismic slips of 1.7 ± 0.15 and 3.5 ± 0.15 m at 6.16 ± 0.52 and ~35.91 ka, respectively. The entire rupturing of the thrust system can produce Mw 7.65 ± 0.03 earthquakes.

中文翻译：

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2019年3月28日Mw 5.04曼雅地震断层的地下地震破裂，几何形状，历史地表变形和地震潜力

在2019年3月28日Mw为5.04茫崖地震中受损的石油生产英雄岭（YXL）八个区正在进行的钻探钻孔，藏北西南柴达木。井眼破坏提供了直接测量同震滑动，破裂面积和地震矩的机会。破坏显示出地下破裂面积为45.30±10.24 km ²，最大滑移为400±13 mm，发震断层倾角约为38.6°。这些参数产生的地震矩为（1.81±0.47）×10 ¹⁷ Nm，力矩幅值为5.47±0.16。地震勘探表明，SZG坡道的几何形状，即多弯曲的应雄岭逆冲推力系统的最上部，主要与井眼破坏引起的破裂平面和震源机制解的一个平面一致。这表明这次地震是由于坡道滑倒造成的。YXL推力系统的悬挂壁形成了复杂的断弯褶皱YXL防潮层。沿YXL的两个边缘的主动推力和折叠证明了该推力系统的西南偏角。生长地层显示推力系统的平均滑移率在每年〜0.2至〜0.3 mm之间。西南边缘最近冲断和折叠的冲积层表明有两个冲断事件，同震滑移分别为1.7±0.15和3.5±0.15 m（6.16±0.52和〜35.91 ka），分别。推力系统的整个破裂会产生Mw 7.65±0.03地震。