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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Seismogenesis and deformation in the Deccan Volcanic Province, Peninsular: India
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Seismogenesis and deformation in the Deccan Volcanic Province, Peninsular: India

机译：德干火山省的地震发生和变形，半岛：印度

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Fault stability margin (SM) due to Deccan Trap overburden estimated for limiting boundary conditions and pore pressures that are not lithostatic is highest along the western pericontinental belt of active rifts (BARS) (h = 1.5 km, SM similar to 146 bars). Despite maximum strengthening of weak faults, the frequency of earthquakes is the highest in the BARS. Seismogenesis in the DABS is, therefore, attributed to augmentation of compressive stresses, though erosion and isostatic uplift may play a subordinate role in the southern part, The SM for pore pressures that totally cancel the normal stress Is zero but it is suggested that such conditions may ire pare where the hypocentres are shallow and the weak faults are possibly open to the surface. The strain rates for events of M greater than or equal to 4.0 and/or I greater than or equal to 5 in the time span 1750-1997 AD (247 years) are the highest for the Kutch seismic domain, being 3.5 x10(-8)/yr. They are similar for the BARS and SONATA belt being 1.2-1.5 x 10(-11)/yr, and are lower by an order of magnitude (1.7-4.2 x 10(-11)/yr) in the Godavari and Saurashtra domains which have: a more closely comparable continental crustal structure. The moment rate tensors estimated for BARS indicate the dominance of N-S compressional stresses. In view of preferred N-S orientation of BARS, we. tend to believe Brat ridge push forces along the mid-Indian Ocean ridges may have a dominant contribution Lo the stress field of this region matching the Himalayan back thrust. The difference In moment release pattern between the BARS and the SONATA belt is probably due to the: contrasting deep continental structure of these regions, The uncertainties in estimation of seismic moments, particularly for historical events, and other assumptions render the above conclusions tentative. However, differences of one or two orders of magnitude in strain rates and concordance of observations with geological and stress field measurements enhance their credibility. [References: 30]
机译：在有限的边界条件和非岩石静力学的孔隙压力下，由Deccan Trap覆盖层引起的断层稳定裕度（SM）在活动裂谷（BARS）的西部洲际带上最高（h = 1.5 km，SM类似于146巴）。尽管最大程度地增强了弱断层，但地震频率在BARS中最高。因此，尽管南部的侵蚀和等静压升高可能起着次要作用，但DABS的地震发生是由于压应力的增加而引起的。孔隙压力的SM完全抵消了正应力，但SM认为是零。在震中较浅且弱断层可能向地面敞开的地方可能会减少雨水。 M大于或等于4.0和/或I大于或等于5的事件在1750-1997 AD（247年）期间的应变率在库奇地震域中最高，为3.5 x10（-8 ）/年。对于BARS和SONATA带，它们相似，为1.2-1.5 x 10（-11）/ yr，在Godavari和Saurashtra域中降低了一个数量级（1.7-4.2 x 10（-11）/ yr），有：具有更接近的大陆地壳结构。 BARS估计的矩速率张量表明N-S压缩应力占主导地位。鉴于BARS的首选N-S方向，我们。人们倾向于认为，沿印度洋中部海脊的布拉特海脊推力可能是该地区应力场与喜马拉雅反向推力相匹配的主要贡献力。 BARS和SONATA带之间的矩释放模式差异可能是由于：这些地区的深层大陆结构形成对比;地震矩估计的不确定性，特别是历史事件的不确定性，以及其他假设使上述结论具有暂定性。但是，应变率相差一两个数量级以及观测值与地质和应力场测量值的一致性提高了它们的可信度。 [参考：30]

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