This paper studies the imminent anomalies observed by the Sacks volume strainmeter in Erzhangying station and Tiantanghe station before 80 earthquakes with Ms≥ 7. 0 which took place from January 2011 to April 2014 al...This paper studies the imminent anomalies observed by the Sacks volume strainmeter in Erzhangying station and Tiantanghe station before 80 earthquakes with Ms≥ 7. 0 which took place from January 2011 to April 2014 all over the world. Then, preconditions for anomaly identification are put forward for complex earthquake cases. Statistical results show that volume strain observation has a better earthquake reflecting ability for earthquakes with magnitudes larger than 7. 0 and epicentral distance within 8000kin. In addition, these results also reflect that the volume strain observation can better reflect precursory anomalies of such earthquakes. Based on categorization and description of those anomalies, we divide the anomalies into three types, that is, earth tide distortion type, abrupt change type and slow earthquake type. Furthermore, the paper makes a statistical analysis of these types and preliminarily discusses their mechanical properties as well. According to research, volume strain anomaly has an indicative significance to future strong earthquakes in the world.展开更多
China is the country with the most earthquakes and the most serious hazards from continental earthquakes in the world. During the 1960s and 1970s, a series of strong earthquakes attacked the cities and counties in Chi...China is the country with the most earthquakes and the most serious hazards from continental earthquakes in the world. During the 1960s and 1970s, a series of strong earthquakes attacked the cities and counties in China causing great damage and many casualties. The most striking one was the Tangshan earthquake ( M S7 8) in July 1976, in which over 240,000 people died and a large industrial city was leveled. Public demand for earthquake forecasting surged after this disaster. From the mid-1960s, systemic research on earthquake forecasting has evolved throughout the country. In this paper the main advances in earthquake prediction research in China have been summarized.展开更多
基金Combined project of monitoring,prediction and research of China Earthquake Administration entitled "Statistical study on the earthquake cases of imminent anomaly in Sacks volume strain measurements(154201)""Special Fund for Basic Scientific Research of Institute of Earthquake Science,CEA(2012IES010202)""Research on Regional Tectonic Stability for the Dateng Gorge Water Conservancy Hub Project Site(880456)"
文摘This paper studies the imminent anomalies observed by the Sacks volume strainmeter in Erzhangying station and Tiantanghe station before 80 earthquakes with Ms≥ 7. 0 which took place from January 2011 to April 2014 all over the world. Then, preconditions for anomaly identification are put forward for complex earthquake cases. Statistical results show that volume strain observation has a better earthquake reflecting ability for earthquakes with magnitudes larger than 7. 0 and epicentral distance within 8000kin. In addition, these results also reflect that the volume strain observation can better reflect precursory anomalies of such earthquakes. Based on categorization and description of those anomalies, we divide the anomalies into three types, that is, earth tide distortion type, abrupt change type and slow earthquake type. Furthermore, the paper makes a statistical analysis of these types and preliminarily discusses their mechanical properties as well. According to research, volume strain anomaly has an indicative significance to future strong earthquakes in the world.
文摘China is the country with the most earthquakes and the most serious hazards from continental earthquakes in the world. During the 1960s and 1970s, a series of strong earthquakes attacked the cities and counties in China causing great damage and many casualties. The most striking one was the Tangshan earthquake ( M S7 8) in July 1976, in which over 240,000 people died and a large industrial city was leveled. Public demand for earthquake forecasting surged after this disaster. From the mid-1960s, systemic research on earthquake forecasting has evolved throughout the country. In this paper the main advances in earthquake prediction research in China have been summarized.
