Effective relaxation time and viscosity of the earth inferred from the postseismic vertical deformations of the 1990 M S=7.0 Gonghe earthquake |
| |
Authors: | Qing-Liang Wang Shou-Wen Gong Xi Zhang Yi-Qing Zhu |
| |
Affiliation: | (1) The Second Crustal Deformation Monitoring Center, State Seismological Bureau, 710054 Xi’an, China |
| |
Abstract: | The postseismic vertical deformation rates of the 1990 Gonghe M S=7.0 earthquake appears to have decreased exponentially. Based on Okada’s coseismic surface displacement solution caused by a uniform fault slip in an elastic homogeneous half space, we derived its postseismic surface displacement by using a single-layer standard linear solid model, and further derived a simplified formula for determining the effective relaxation time and viscosity of the earth, which is independent of the dislocation parameters of the causative fault. From the postseismic vertical deformation of the 1990 Gonghe earthquake, we inferred that the effective relaxation time defined by τ=η/μ is 2.6 years, and the effective viscosity η is about 1018 Pa · s. This work was supported by Chinese Joint Seismological Science Foundation under the grants 92088 and 196098. |
| |
Keywords: | Gonghe earthquake postseismic vertical deformation earth medium relaxation time viscosity |
本文献已被 SpringerLink 等数据库收录! |