The possibility of estimating the coseismic deformation from water level observations in wells
- 32 Downloads
A method for point estimation of coseismic volume deformation from amplitudes of earthquake-induced jumps in the water level and from the tidal sensitivity of the water level is presented. Application of this method is illustrated by six Kamchatka earthquakes of 1997–2004 with M w = 6.2–7.8 that occurred 128–316 km from the YuZ-5 well. Estimates of coseismic deformation provided by the level gage observations and by the model agree in amplitude and sign. The model reproduces an extended dislocation source in a homogeneous elastic isotropic half-space. Source rupture parameters correspond to focal mechanisms from the CMT international catalog. Consistence in experimental and theoretical estimates of the volume coseismic deformation indicates the high strain-resistance properties of YuZ-5 borehole and the possibility of quantitative estimation of seismotectonic deformation from high-precision water level measurements with time resolution not lower than 10 minutes.
KeywordsSolid Earth Earth Quake Hypocentral Distance Water Level Variation Groundwater Reservoir
Unable to display preview. Download preview PDF.
- 1.S. V. Boldina and G. N. Kopylova, “Estimation of the Inertial Effect of Water Exchange between a Borehole and a Groundwater Reservoir,” in Vestnik KRAUNTs, Series Earth Sciences, No. 2, Iss. 8, 112–119 (2006) [in Russian].Google Scholar
- 2.A. A. Gusev and B. N. Mel’nikova, “Relations between Magnitudes—World-Average and for Kamchatka,” Vulkanol. Seismol., No. 6, 55–63 (1990).Google Scholar
- 3.I. G. Kissin, “Hydrogeological Monitoring of the Earth’s Crust,” Fizika Zemli, No. 8, 58–69 (1993).Google Scholar
- 4.G. N. Kopylova, “Water-Level Variations in Borehole YuZ-5, Kamchatka, Caused by Earthquakes,” Vulkanol. Seismol., No. 6, 52–64 (2006).Google Scholar
- 5.G. N. Kopylova and S. V. Boldina, “Estimation of Poroelasic Parameters of a Groundwater Reservoir (from Data of Level-Gauge Observations in Borehole YuZ-5, Kamchatka),” Vulkanol. Seismol., No. 2, 17–28 (2006).Google Scholar
- 6.V. I. Levina, F. F. Gusev, V. M. Pavlov et al., The Kronotskoe Earthquake of December 5, 1997 with M z = 7.8, I 0 = 8 (Kamchatka),” in Earthquakes in North Eurasia in 1997 (GS RAN, Obninsk, 2003) [in Russian].Google Scholar
- 7.P. Melchior, The Earth Tides (Oxford, 1966; Mir, Moscow, 1968).Google Scholar
- 8.Y. Okada, “Surface Deformation Due to Shear and Tensile Faults in a Half-Space,” Bull. Seism. Soc. Amer. 75, 1135–1154 (1985).Google Scholar
- 9.Yu. V. Riznichenko, “Dimensions of a Crustal Earthquake Source and Seismic Moment,” in Investigations in the Physics of Earthquakes (Nauka, Moscow, 1976) [in Russian].Google Scholar
- 13.H. Wakita, “Water Levels as Possible Indicators of Tectonic Strain,” Science, No. 189, 553–555 (1975).Google Scholar
- 14.H. G. Wenzel, “Earth Tide Analysis Package ETERNA 3.0,” BIM, No. 118, 8719–8721 (1994).FIGURE CAPTIONS.Google Scholar