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Lineaments in Deccan Basalts: The Basement Connection in the Koyna–Warna RTS Regionстатья Исследовательская статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 7 декабря 2018 г.
- Авторы: Arora K., Srinu Y., Gopinadh D., Chadha R.K., Raza H., Mikhailov V., Ponomarev A.V., Kiseleva E., Smirnov V.
- Журнал: Bulletin of the Seismological Society of America
- Том: 108
- Номер: 5B
- Год издания: 2018
- Издательство: Seismological Society of America
- Местоположение издательства: United States
- Первая страница: 2919
- Последняя страница: 2932
- DOI: 10.1785/0120180011
- Аннотация: We analyzed the configurations of the lineaments derived from imagery and airborne light detection and ranging (lidar) data in the Koyna–Warna region of reservoir-triggered seismicity (RTS). These lineaments generally correlate with aero- magnetic and gravity anomalies that may be caused by basement discontinuities and fracture systems that are expressed as north–south, northwest–southeast, and north- east–southwest features on the surface. Our results from Synthetic Aperture Radar (SAR) interferometry show displacement fields close to the Warna reservoir after M ≥ 5:0 earthquakes in 2009. Direct evidence of faulting and slip surfaces is encoun- tered as slickensides in deep boreholes in the region. Acoustic televiewer imaging in these boreholes shows varying patterns of fractures in the basement and in the over- lying Deccan basalts. These new data support an inheritance model for basement fault- ing involving repeated reactivation and upward propagation of basement faults and fractures into the overlying Deccan Trap strata. We suggest that the Koyna and Warna reservoirs overlie a shear zone possibly connecting the eastern and western Dharwar cratons exposed in southern India. The repeated movements along basement faults in this shear zone enhance porosity and permeability of the fractures and provide con- duits for water percolation and increase of pore fluid pressure. The presence of such fluid-filled fractured basement rocks in the Koyna–Warna region may explain the con- tinuously triggered earthquakes during the past five decades.
- Добавил в систему: Смирнов Владимир Борисович