Post-seismic relaxation from geodetic and seismic data

We have examined the aftershock sequence and the post-seismic deformation process of the Parkfield earthquake (2004, M = 6, California, USA) source area using GPS data. This event was chosen because of the possibility of joint analysis of data from the rather dense local GPS network (from SOPAC Internet archive) and of the availability of the rather detailed aftershock sequence data (http://www.ncedc.org/ncedc/catalog-search.html). The relaxation process of post-seismic deformation prolongs about the same 400 days as the seismic aftershock process does. Thus, the aftershock process and the relaxation process in deformation could be the different sides of the same process. It should be noted that the ratio of the released seismic energy and of the GPS obtained deformation is quite different for the main shock and for the aftershock stage. The ratio of the released seismic energy to the deformation value decreases essentially for the post-shock process. The similar change in the seismic energy/deformation value ratio is valid in a few other strong earthquakes. Thus, this decrease seems typical of aftershock sequences testifying for decrease of ratio of elastic to inelastic deformation in the process of post-shock relaxation when the source area appears to be mostly fractured after the main shock occurs, but the healing process had no yet sufficient time to develop. © 2017 Institute of Seismology, China Earthquake Administration

Авторы
Rodkin M.V.1, 2 , Kaftan V.I. 3, 4
Редакторы
-
Издательство
KeAi Communications Co.
Номер выпуска
1
Язык
Английский
Страницы
13-16
Статус
Опубликовано
Подразделение
-
Номер
-
Том
8
Год
2017
Организации
  • 1 Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, Russian Federation
  • 2 Institute of Marine Geology and Geophysics, FEB RAS, Yuzhno-Sakhalinsk, Russian Federation
  • 3 Geophysical Center, Russian Academy of Sciences (GC RAS), Moscow, Russian Federation
  • 4 Peoples’ Friendship University of Russia, PFUR, Moscow, Russian Federation
Ключевые слова
Earth's surface deformation; GPS; Post-seismic relaxation; post-shock fracturing
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/6340/