摘要
甘肃及周边地区是一个中强震多发区,该地区的前兆异常对青藏高原北缘地区强震活动有着敏感的反映。1980年以来该区发生5.0级以上地震20余次。多次地震前,甘肃地区的水氡资料出现了大量的中短期异常。分析了甘肃省目前仍在继续观测、观测环境较好、仪器稳定的水氡测点在甘肃及周边地区发生的中强地震前资料的变化情况,发现多数测点在多次地震前存在明显的中短期异常,有些为短临异常。嘉峪关气氡映震效果最好,异常形态以破年变为主。武山1号泉水氡和天水花牛水氡也以破年变或低值异常为主,清水流量以高值异常为主。某些大震前以同步变化的趋势异常为主。
Medium earthquake often occurrs in Gansu and its adjacent areas,the precursory anomalies can sensitively reflect the strong earthquakes in the northern Tibetan Plateau.More than 20 earthquakes with M≥5.0 have occurred in this area since 1980.There were plentiful medium and short term anomalies of water radon before some earthquakes in Gansu region.This paper analyzed the change of data in the water radon points in Gansu province before medium earthquakes,which had continuously observation,best observation environment and stable instrument,and found obvious medium-short term anomalies or short-impending anomalies appearing before some earthquakes in most points.The earthquake-reflecting effect of gas radon is best in Jiayuguan and the anomalous shape mainly is broken annual variation.Precursory anomalies of water radon in Wushan 1st spring and Tianshui Huaniu are mostly broken annual variation or low value anomaly,precursory anomaly of Qingshui flow is high value anomaly.The main anomaly appearing before some big earthquakes is trend anomaly of synchronized change
出处
《华南地震》
2011年第1期10-17,共8页
South China Journal of Seismology
基金
甘肃地震重点危险区震情深入跟踪(2010010105)
甘东南-陕甘宁地震重点危险区及邻区强震危险性分析及跟踪研究(2010010110)
