[1]LI Libo,ZHANG Li,FU Hong,et al.Statistic and Analysis on Precursory Anomalies of Water Level[J].Journal of Seismological Research,2016,39(03):436-443.
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Statistic and Analysis on Precursory Anomalies of Water Level
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
39
Number of periods:
2016 03
Page number:
436-443
Column:
Public date:
2016-07-23
- Title:
- Statistic and Analysis on Precursory Anomalies of Water Level
- Keywords:
- earthquake preparation; precursory anomaly; water level anomaly; anomaly index; anomaly amplitude
- CLC:
- P315.723
- DOI:
- -
- Abstract:
- Based on“Earthquake Cases in China”which was formally published from 1966 to 2006,we selected the water level precursory anomalies data of M≥5.0 earthquakes, and analyzed the anomaly shape, anomaly amount, anomaly amplitude and anomaly time of water level, epicenter distance distribution, and magnitude etc.. We found that the amount of rising pattern of water level which was the most accounted for 43.82%, and the higher the magnitude was, the more the amount of water level anomaly was. When the gradient amplitude of water level was more than 3.0 cm,the mutation amplitude was more than 0.5 cm, and the amplitude of broken annual variation was no more than 70% or no less than 120%, we could judge it as the precursory anomalies of water level. The higher the magnitude was, the wider range of the water level anomaly was. The longer the time of water level anomaly concentrated appeared before the earthquake, the longer the distance of water level anomaly from the epicenter was. The characteristic of the earthquake preparation which was going into shorten and impending earthquake stage shows as follow: the amount of water level anomaly decreased suddenly in Yunnan and Sichuan-Yunnan area from 50 to 75 days before the earthquake, then increased. The amount of water level anomaly decreased in 75 days before the earthquake in northwest area of Yunnan, and increased sharply in 50 days before the earthquake in other area, and it increased gradually in 100 days before the earthquake in China.
- References:
- -
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Last Update:
1900-01-01