Post-seismic deformations in the focal region of the 1995 Hyogo-ken Nanbu earthquake were observed with GPS observations. More than 30 GPS stations were deployed in and around the area of aftershock activity within several days after the occurrence of the earthquake. First the data were stored and manually collected at the observation sites, but by the middle of February the data at most of sites were started to be telemetered through public phone lines to data centers. GPS observations continued until the end of March, except for 4 sites left active for monitoring long-term deformations. Two types of GPS observations were used, usual static and real-time kinematic GPS observations. Static day-by-day analyses, show the deformation associated with post-seismic readjustment with a relaxation time of about 70 days and with an amplitude of 1-2 cm in the area close to the epicenter. Present real-time kinematic GPS observations show scatters with the amplitude of 0.5-3.0 cm depending on components and baseline lengths. Any motions with amplitudes larger than these noise levels could not be detected during the observation period.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)