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yexuqing木虫之王 (文学泰斗)
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极长程动态触发作用导致泥火山活化与6级静默断层滑动
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Very-long-range dynamic triggering of mud volcano unrest and silent magnitude-6 fault slip 极长程动态触发作用导致泥火山活化与6级静默断层滑动 ▲ 作者：Zaur Bayramov, Renier Viltres et al. ▲ 链接： https://www.science.org/doi/10.1126/science.adv8438 ▲ 摘要： 众所周知，大地震产生的地震波能够触发远距离的断层滑动，但其内在机制尚不明确。通过采用干涉合成孔径雷达技术并结合局部大地测量与地震数据，我们发现2023年2月发生在土耳其东南部的卡赫拉曼马拉什地震（震中距约1000公里）导致了西里海地区富含流体的库拉盆地内56处泥火山发生形变和/或喷发，并在七条断层上引发长达数十公里的厘米级静默滑动。 这次等效矩震级达6.1的瞬态形变事件，与主要油气田下方的局部隆升现象密切相关。我们推测地震波导致深层孔隙压力变化，进而触发沿盆地及周边多条地壳断层的静默滑动。 ▲ Abstract： Seismic waves from large earthquakes are known to trigger slip on distant faults, but the underlying mechanisms remain unclear. Using interferometric synthetic aperture radar and local geodetic and seismic data, we show that the 1000-kilometer-distant, February 2023 Kahramanmara? earthquakes in southeastern Türkiye triggered deformation and/or eruption at 56 mud volcanoes and centimeter-scale aseismic slip on seven faults over tens of kilometers within the fluid-rich Kura Basin in the West Caspian region. This transient deformation event, with an equivalent moment magnitude of 6.1, was coupled with local inflation below major hydrocarbon fields. We postulate that seismic waves led to a change in pore pressure at depth, which in turn triggered aseismic slip along several crustal faults crossing the basin and its surroundings. |
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