| Autor: |
Rasskazov, Sergei, Ilyasova, Aigul, Bornyakov, Sergei, Chuvashova, Irina, Chebykin, Eugene |
| Zdroj: |
Frontiers of Earth Science; 2020, Vol. 14 Issue 4, p711-737, 27p |
| Abstrakt: |
In the western part of the South Baikal Basin, spatial-temporal distribution of earthquake epicenters shows quasi-periodic seismic reactivation. The largest earthquakes that occurred in 1999 (MW = 6.0) and 2008 (MW = 6.3) fall within seismic intervals of 1994–2003 and 2003–2012, respectively. In the seismic interval that began in 2013, the 234U/238U activity ratio (AR) in groundwater was monitored assuming its dependence on crack opening/closing that facilitated/prevented water circulation in an active boundary fault of the basin. Transitions from disordered, high-amplitude fluctuations of AR values to consistent, low-amplitude fluctuations in different monitoring sites were found to be sensitive indicators of both small seismic events occurring directly on the observation area, and of a large remote earthquake. The hydroisotopic responses to seismic events were consistent with monitoring data on deformation and temperature variations of rocks. The hydroisotopic effects can be applied for detecting a seismically dangerous state of an active fault and prediction of a large future earthquake. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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