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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Thermal anomalies in relation to earthquakes in India and its neighbourhood
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Thermal anomalies in relation to earthquakes in India and its neighbourhood

机译：与印度及其附近地区地震有关的热异常

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Thermal anomalies based on satellite and surface meteorological data in the epicentral region prior to a few earthquakes in India and elsewhere have raised a question whether such inferences can be relied upon keeping in view larger meteorological variability associated with synoptic weather changes. This article examines outgoing longwave radiation (OLR) data by INSAT over Sikkim region to find whether any anomaly developed prior to the earthquake of September 2011 (M-w 6.9). Similar study was made using surface meteorological data (weather observatories or NCAR grid point values) in the meizoseismal areas of Bhadrachalam (1969, m(s) 5.7), Kinnaur (1975, m(s) 6.9), Bihar-Nepal (1988, m(s) 6.9), Uttarkashi (1991, m(s) 6.8), Latur (1993, m(s) 6.1), Jabalpur (1997, m(s) 5.6), Chamoli (1999, m(b) 6.5), Bhuj (2001, M-w 7.6) and Muzaffarabad (2005, M-w 7.6) earthquakes. The OLR data from INSAT were also examined during heat-wave conditions prevailing over northern India in summer during non-seismic conditions. It was found that there was no significant thermal anomaly prior to any earthquake in the Indian region. It has been shown that the precursory thermal anomaly reported in earlier studies for Bhuj (2001), Muzaffarabad (2005), Jabalpur (1997) and Latur (1993) earthquakes was misinterpreted since the rise in surface temperature (if any) was found to be well within the meteorological variability caused by synoptic weather conditions. Persistent heat-wave conditions causing very large thermal anomaly for several days in northern India raise false alarms. The synthesis of the results presented in this study should desist geoscientists from considering thermal anomalies as earthquake precursors.
机译：在印度和其他地方发生几次地震之前，基于震中地区卫星和地面气象数据的热异常提出了一个问题，即是否可以依靠这样的推论来考虑天气天气变化带来的更大的气象变异性。本文研究了INSAT在锡金地区上空的长波辐射（OLR）数据，以发现在2011年9月地震之前（M-w 6.9）是否出现了任何异常现象。利用地表气象数据（气象台或NCAR网格点值）在Bhadrachalam（1969，m（s）5.7），Kinnaur（1975，m（s）6.9），Bihar-Nepal（1988， m（s）6.9），Uttarkashi（1991，m（s）6.8），Latur（1993，m（s）6.1），Jabalpur（1997，m（s）5.6），Chamoli（1999，m（b）6.5） ，布杰（2001，兆瓦7.6）和穆扎法拉巴德（2005，兆瓦7.6）地震。在夏季，在非地震条件下，印度北部盛行的热浪条件下，也检查了INSAT的OLR数据。发现在印度地区发生地震之前，没有明显的热异常。事实表明，早先的研究报道了Bhuj（2001），Muzaffarabad（2005），Jabalpur（1997）和Latur（1993）地震的前兆热异常，因为发现地表温度升高（如果有）是错误的天气天气条件引起的气象变异范围内。在印度北部，持续持续数天的热浪条件导致非常大的热异常，引发了虚假警报。本研究结果的综合应该阻止地球科学家将热异常视为地震的先兆。

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