Electronic Supplement to
Analysis of Coseismic Water-Level Changes in the Wells in the Koyna-Warna Region, Western India
by Kalpna Gahalaut, V.K. Gahalaut and R.K.Chadha
This electronic supplement contains a table and a figure. Table S1 provides details about rupture length, width and slip that have been used to calculate strain field for a given earthquake. Fig.S1 provides five examples of step like changes at five confined wells.
Table
Table S1. Details about the fault parameters to calculate strain using mathematical formulation of Okada (1992). Rupture length, width and slip have been calculated from the earthquake magnitude using the scaling relations of Wells and Coppersmith (1997). USGS- United States Geological Survey.
| Date and magnitude of earthquake | Fault plane solution strike, dip, rake (reference) | Length (km) | Width (km) | Slip (cm) |
|---|---|---|---|---|
| April 25, 1997; 4.4 | 210,55,0 (Chadha, 2005) | 1.2 | 1.5 | 9 |
| February 11, 1998; 4.3 | 321,46.5,132 (Bhattacharya, 2007) | 1.1 | 1.4 | 9 |
| March 12,2000; 5.0 | 352,23,-95 (USGS) | 1.8 | 1.8 | 27 |
| April. 6, 2000; 4.7 | 341,42.6,-95 (Bhattacharya, 2007) | 1.6 | 1.7 | 22 |
| September 5, 2000; 5.2 | 338,44.5,-109 (Bhattacharya, 2007) | 2.0 | 1.9 | 30 |
| March 14, 2005; 4.9 | 334,40,-118 (USGS) | 1.7 | 2.0 | 26 |
Figure
Figure S1. Five examples of step like coseismic changes at five confined wells (Chadha et al., 2008; Singh et al., 2008).
References
Bhattacharya, S.N. (2007), Moment tensor solutions and triggering environment for earthquakes in Koyna-Warna water reservoirs, India. Pure Appl. Geophys., DOI 10.1007/s00024-007-0199-2.
Chadha, R.K., Srivastava, K., and Kümpel, H.-J., (2005), Earthquake-related changes in well water level and their relation to a static deformation model for the seismically active Koyna-Warna region, India. Rock mechanics with emphasis on stress, F Rummel (Ed.), Balkema Publ., Leiden, 135-150.
Chadha, R.K., Kuempel, H.-J. and Shekar, M. (2008), Reservoir triggered seismicity (RTS) and well water level response in the Koyna-Warna region, India. Tectonophysics, 456, 94-102.
Okada, Y., (1992), Internal deformation due to shear and tensile faults in a half-space. Bull. Seism. Soc. Am. 82, 1018-1040.
Singh, C. Ramana, D.V., Chadha, R.K. and Shekar, M. (2008), Coseismic responses and mechanism behind Mw 5.1 earthquake of March 14, 2005 in the Koyna-Warna region, India. Journal of Asian Earth Sciences, 31, 499-503.
Wells D.L. and Coppersmith K.J., (1994), New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement. Bull. Seismol. Soc. Am. 84, 4 (1994), 975–1002.