Seismogenesis and occurrence of earthquakes as observed by temporally continuous gravity variations in China

Gu, Gongxu; Kuo, John T.; Liu, Keren; Zheng, Jinhan; Lü, Heng; Duan-fa, Liu

doi:10.1007/bf02885502

Cited by 16 publications

(19 citation statements)

References 7 publications

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“…Although the potential of using gravity data for earthquake research was recognized nearly 50 years ago [13][14][15][16][17][18][19][20], there existed few cases demonstrating the usefulness of gravity monitoring data for useful earthquake forecast. Based on discussions presented above, we argue that information derived from large-scale regional gravity monitoring data has the potential to be used as a precursor for forecasting large earthquakes in a medium-term of no more than five years, particularly when that information is combined with expert knowledge about historic seismic activities, seismicity rate, as well as geological and tectonic conditions in the region in question.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Medium-Term Earthquake Forecast Using Gravity Monitoring Data: Evidence from the Yutian and Wenchuan Earthquakes in China

Zhu

Zhan

2012

International Journal of Geophysics

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We review the gravity monitoring data and methods upon which the researchers reached these medium-term earthquake forecasts. Experience related to the medium-term forecasts of the Yutian and Wenchuan earthquakes suggests that gravity changes derived from regional gravity monitoring data could potentially be a useful medium-term precursor of large earthquakes, but significant additional research is needed to validate and evaluate this hypothesis.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Medium-Term Earthquake Forecast Using Gravity Monitoring Data: Evidence from the Yutian and Wenchuan Earthquakes in China

Zhu

Zhan

2012

International Journal of Geophysics

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“…Attempts for searching gravity precursors for empirical earthquake prediction based on regional gravity variations have had encouraging results (CHEN et al 1979;GU et al 1997;KUO and SUN 1993;LIU et al 2002;ZHU et al 2010ZHU et al , 2012ZHU et al , 2013. At present, the gravity variation data comes from the geophysical field observation and has been widely used to analyze the earthquake risk and the earthquake predictions in China.…”

Section: Introductionmentioning

confidence: 99%

Statistical Evaluation of Efficiency and Possibility of Earthquake Predictions with Gravity Field Variation and its Analytic Signal in Western China

Chen

Jiang

Zhuang

2015

Pure Appl. Geophys.

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This paper aimed at assessing gravity variations as precursors for earthquake prediction in the Tibet (Xizang)-QinghaiXinjiang-Sichuan Region, western China. We here take a statistical approach to evaluate efficiency and possibility of earthquake prediction. We used the most recent spatiotemporal gravity field variation datasets of 2002-2008 for the region that were provided by the Crustal Movement Observation Network of China (CMONC). The datasets were space sparse and time discrete. In 2007-2010, 13 earthquakes ([M s 6.0) occurred in the region. The observed gravity variations have a statistical correlation with the occurrence of these earthquakes through the Molchan error diagram tests that lead to alarms over a good fraction of space-time.The results show that the prediction efficiency of amplitude of analytic signal of gravity variations is better than seismicity rate model and THD and absolute value of gravity variation, implying that gravity variations before earthquake may include precursory information of future large earthquakes.

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“…When studying the relations among activity of ground water, gravity anomaly and earthquake, Gu et al [36] found before Datong Earthquake of M L =6.1 in October 1989, during June to July anomaly appeared in the water level of Gaocun logging which was located on southeastern of Beijing and was about 270 km apart from Datong. The characteristic of the anomaly was very similar to the response of the residual gravity variations obtained by Baijiatuan Station in which the effect of surface water was deducted.…”

Section: Significance and Research Progress Of Atlr Anomalies Before mentioning

confidence: 99%

“…The depth of the logging is 3200 m deep, and its water level variations were nearly not affected by precipitation, revolution of the seasons and other ground factors. They thought the gravity variations and the water level variations of Gaocun logging reflected the same morphology of dynamical earthquake formation process [36]. The time when the anomaly appeared was almost the same with the time of the appearance of ATLR anomaly in Beijing Observatory's PA which was located about 16 km east of Baijiatuan Station [17].…”

Section: Significance and Research Progress Of Atlr Anomalies Before mentioning

confidence: 99%

“…When studying earthquakes of northern China from 1981 to 1991, Gu et al [36] found the water level variations just responded to part of the earthquakes that occurred during this period. The explanation they provided was that the earthquakes which brought about responses might locate in the same hydrogeological system of Jiluyu fault-block.…”

Section: Problems That Need To Be Studied In-depthmentioning

confidence: 99%

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Progress of research on anomalies of astronomical time and latitude observations before earthquake

2012

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This paper introduces the discovery of the phenomenon that short-term anomalous fluctuations appeared in residuals of astronomical time and latitude observations before earthquakes and the progress of related researches carried out for many years. The relations between the anomalous variations of time and latitude residuals of astronomical time and latitude instruments in different regions and the earthquakes around these instruments as well as the characteristics of residuals' anomalous variations are analyzed. The significance of the anomalous fluctuations in residuals of astronomical time and latitude caused by the anomalous variations of the local plumb line before earthquake and detecting the vertical variation with astronomical time and latitude observations as well as the importance of carrying out further researches are discoursed. The possibility that the phenomenon will become an effective short-term earthquakes precursor, the current situations and the problems to be solved, are discussed. Also we offer the proposals to develop new roboticized astrometric instruments with high-precision and set up test observation networks in earthquake-prone areas in order to do research in-depth, optimize methods of observing and extracting anomalous information for short-term earthquake prediction, and so on. Earthquake is one of the most serious natural disasters. A strong earthquake may create a large number of casualties and huge property losses. The earthquakes, which occurred in

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Seismogenesis and occurrence of earthquakes as observed by temporally continuous gravity variations in China

Cited by 16 publications

References 7 publications

Medium-Term Earthquake Forecast Using Gravity Monitoring Data: Evidence from the Yutian and Wenchuan Earthquakes in China

Medium-Term Earthquake Forecast Using Gravity Monitoring Data: Evidence from the Yutian and Wenchuan Earthquakes in China

Statistical Evaluation of Efficiency and Possibility of Earthquake Predictions with Gravity Field Variation and its Analytic Signal in Western China

Progress of research on anomalies of astronomical time and latitude observations before earthquake

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