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Earthquakes over Kutch: A region of 'trident' space-time geodynamics

机译:库奇地震:“三叉戟”时空地球动力学地区

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摘要

Kutch peninsula exhibits enigmatically rapid stress accumulation/release like the New Madrid Seismic Zone. Geodynamically, it is a junction of three structural trends and three tectonothermal episodes (69-64 Ma). Combination of mobile belts and plume, evidenced here, favours lithospheric splaying, reactivation, rifting, alkaline complexes; resulting tectonic network may link Kutch with plate boundaries. The 1819 and 2001 events have occurred near the intersection, of such lineaments and accretionary belts, with its margins. Thus, Plate-boundary forces and loading (uplifts/sediments) appear to superimpose here, over relatively weakened lithosphere; and resulting litho/hydro-spheric instability would contribute to development of the Rann. The crust-mantle interactions are supported by (i) positive gravity anomalies, whose obliquity to Kutch rift indicates later reactivation, (ii) lower uppermantle velocity near Kutch, and (iii) differential uplift/subsidence. Deep geophysical probing is necessary to gain greater understanding of earthquake process.
机译:像新马德里地震带一样,库奇半岛展现出令人难以置信的快速应力积累/释放。在地球动力学上,它是三个结构趋势和三个构造热事件(69-64 Ma)的交汇处。此处证明的移动带和羽状流的结合有利于岩石圈张开,活化,裂谷,碱性复合物;形成的构造网络可能会将Kutch与板块边界联系起来。 1819年和2001年的事件发生在这样的边缘和增生带的交点附近,边缘也很明显。因此,在相对较弱的岩石圈上,板块边界力和载荷(隆起/沉积物)似乎在此叠加。并且由此产生的岩石/水球不稳定性将有助于Rann的发展。地壳—幔幔的相互作用受(i)正重力异常的支持,该异常对库奇裂谷的倾角表明以后要重新激活,(ii)靠近库奇的上地幔速度较低,以及(iii)差异抬升/沉降。为了深入了解地震过程,必须进行深层地球物理探测。

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