eprintid: 1466 rev_number: 21 eprint_status: archive userid: 2 dir: disk0/00/00/14/66 datestamp: 2015-02-10 12:21:05 lastmod: 2017-02-08 12:21:32 status_changed: 2015-04-27 12:10:57 type: article metadata_visibility: show creators_name: Chadha, Rajender Kumar creators_name: Pandey, Prabha creators_name: Kuempel, Hans Joachim corp_creators: National Geophysical Research Institute, Hyderabad, India corp_creators: National Geophysical Research Institute, Hyderabad, India corp_creators: Leibniz Institute for Applied Geosciences, Hannover, Germany title: Search for earthquake precursors in well water levels in a localized seismically active area of Reservoir Triggered Earthquakes in India ispublished: pub subjects: MP2 subjects: MP4 subjects: RI1 subjects: SR divisions: EPOS-P full_text_status: none abstract: Four cases of coseismic changes are observed in water levels recorded at a close network of wells around seismically active Koyna-Warna region in western India during 1997–2000. While coseismic increase of 2–7 cm in water levels is observed for earthquakes of M 4.3–4.7 in three cases, a trough like decrease of 0.4–8 cm is observed at 7 wells for an M 5.2 earthquake. All these earthquakes occurred within the network of wells drilled for the study. Our results suggest that decrease in water levels prior to these earthquakes may be premonitory in nature. We show that magnitude of the earthquake and epicentral distance are two vital parameters to record anomalous changes. In our study local earthquakes of M ≥ 4.3 are recorded at a maximum distance of about 24 km. Our studies provide first observations from a unique experiment in India, which will have implications in developing earthquake prediction models. INDEX TERMS: 7230 Seismology: Seismicity and seismotectonics; 7223 Seismology: Seismic hazard assessment and prediction; 1899 Hydrology: General or miscellaneous. Citation: Chadha, R. K., A. P. Pandey, and H. J. Kuempel, Search for earthquake precursors in well water levels in a localized seismically active area of Reservoir Triggered Earthquakes in India, Geophys. Res. Lett., 30(7), 1416, date: 2003-04 date_type: published publication: Geophysical Research Letters volume: 30 number: 7 publisher: American Geophysical Union pagerange: 1416-1422 id_number: doi:10.1029/2002GL016694 refereed: TRUE issn: 0094-8276 official_url: http://dx.doi.org/10.1029/2002GL016694 access_IS-EPOS: limited owner: Publisher citation: Chadha, Rajender Kumar and Pandey, Prabha and Kuempel, Hans Joachim (2003) Search for earthquake precursors in well water levels in a localized seismically active area of Reservoir Triggered Earthquakes in India. Geophysical Research Letters, 30 (7). pp. 1416-1422. DOI: https://doi.org/10.1029/2002GL016694