The Response of Water Level in Well YUZ-5, Kamchatka to the Magnitude 9.3,Sumatra-Andaman Earthquake of December 26, 2004

• Published in: Journal of Volcanology and Seismology
• Main Authors: Kopylova G.N., Boldina S.V.
• Format: Text
• Language: Russian; English
• Published: Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд) (Род-Таун) 2007
• Subjects: 37.31.19 Сейсмология; 37.31.27 Земные приливы; 38.61.05 Моделирование гидрогеологических процессов; 38.61.15 Динамика и режим подземных вод; Kamchatka
• Online Access: http://repo.kscnet.ru/2741/; http://repo.kscnet.ru/2741/7/ViS_Sumatra_angl.pdf

Forced and free oscillations of water level were recorded in well YuZ-5, Kamchatka due to the passage of seismic waves from the Sumatra-Andaman earthquake of December 26, 2004, Mw = 9.3, hypocentral distance 8250 km. The greatest amplitude of water level oscillations, at least 5 cm, was observed during the onset of seismic surface waves with a typical period of 20–50 s. The total duration of the forced and free water-level oscillations was about ten hours. The available theoretical models that describe oscillations were used to estimate the transmissivity of the groundwater reservoir. A hypothesis was proposed to explain a temporary increase in reservoir transmissivity during the passage of seismic waves by invoking defective structure of the crack-pore space and a sharp increase in host rock permeability.