Min Liu, Yen Joe Tan, Xinglin Lei, Hongyi Li, Yunpeng Zhang, Weitao Wang
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引用次数: 0
摘要
火山地区通常会发生由中小规模地震组成的地震群,而构造断层则大多会发生包括特大地震在内的主震-余震序列。在青藏高原东南部,印度板块和欧亚板块碰撞形成的大型构造断层与板块内的腾冲火山场相交,这种环境下的地震行为尚不清楚。在此,我们建立了基于深度学习的腾冲火山活动场高精度地震目录,并发现:(1)59%的地震活动以震群形式发生,但发生在与区域构造应力场一致的断层上;(2)所有震群都包含流体扩散样迁移前沿,其中一些发生在已探测到高二氧化碳排放的地方;(3)一个长达一年的震群,包括两个月内的两次 ML 5.2 地震,揭示了复杂的流体-断层相互作用。结合历史上腾冲火山区周围发生的 M > 6 级地震群,我们的观测结果表明,在大型构造断层和岩浆系统交汇的地方,发生大震级地震群的可能性可能会增加。
Intersection between tectonic faults and magmatic systems promotes swarms with large-magnitude earthquakes around the Tengchong volcanic field, southeastern Tibetan Plateau
Volcanic regions commonly host swarms comprising small to moderate-sized earthquakes while tectonic faults host mostly mainshock-aftershock sequences that can include very large earthquakes. In the southeastern Tibetan Plateau, large tectonic faults formed by the collision between the Indian and Eurasian plates intersect with the intraplate Tengchong volcanic field, and the seismic behavior of such an environment remains unclear. Here, we built a deep-learning-based high-precision earthquake catalog for the Tengchong volcanic field and found that (1) ∼59% of the seismicity occurred as swarms but on faults aligned with the regional tectonic stress field; (2) all swarms contained fluid-diffusion-like migration fronts, with some occurring where high CO2 emissions have been detected; and (3) a year-long swarm, including two ML 5.2 earthquakes within two months, revealed complex fluid-fault interaction. Combined with the historical occurrences of M >6 earthquake swarms around the Tengchong volcanic field, our observations suggest potential increased likelihood of swarms with large-magnitude earthquakes where large tectonic faults and magmatic systems intersect.