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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >MICROGRAVITY CHANGES ASSOCIATED WITH CONTINUING SEISMIC ACTIVITIES IN KOYNA AREA, INDIA
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MICROGRAVITY CHANGES ASSOCIATED WITH CONTINUING SEISMIC ACTIVITIES IN KOYNA AREA, INDIA

机译：印度科伊纳地区与持续地震活动有关的微重力变化

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摘要

High-precision gravity measurements were carried out during June-August, 1995 in Koyna area, India, which is known for its high intraplate seismic activities. Daily observations were recorded at four stations with respect to a reference station to monitor the possible gravity changes arising due to crustal deformations associated with seismic activities. Significant relative gravity changes (15-30 mu gal) of almost same pattern were observed at different stations which,is 2-3 times of the observational error. a good correlation was noticed between the relative change in the gravity field from one station to the other and with the occurrences of tremors of magnitude 2-3 which are approximately twenty in number during this period. In most of the cases (18), the relative gravity field first increases and then decreases when the seismic events take place. The observed changes in gravity field seem to be associated with seismic activities, and may be attributed to mass redistribution or seismogenic deformations such as opening of the cracks, etc. in processes taking place during an earthquake. However, the phenomenon is not fully understood and needs more such experiments over longer duration to be conducted in different geological/tectonic settings to understand its actual nature and the mechanism. [References: 38]
机译：1995年6月至8月，在印度科伊纳地区进行了高精度重力测量，该地区以板内高地震活动着称。相对于参考站，在四个站记录了每日观测值，以监视由于与地震活动相关的地壳变形而引起的重力可能发生的变化。在不同的位置观测到几​​乎相同模式的显着相对重力变化（15-30微加仑），是观测误差的2-3倍。从一个站点到另一个站点的重力场的相对变化与此期间发生的大约2-3次震级2-3的震颤之间存在良好的相关性。在大多数情况下（18），当地震事件发生时，相对重力场首先增大，然后减小。观察到的重力场变化似乎与地震活动有关，并且可能归因于在地震发生过程中的质量重新分布或诸如裂缝开裂之类的地震产生变形。但是，这种现象尚未得到充分理解，需要在更长的持续时间内进行更多此类实验，以便在不同的地质/构造背景下进行，以了解其实际性质和机理。 [参考：38]

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