The Palu MW7.4 earthquake occurred on September 28, 2018, with the epicenter at 119.86°, 0.72°. The severe shaking caused severe damage in Central Sulawesi, especially in Palu. We conducted a postseismic def...The Palu MW7.4 earthquake occurred on September 28, 2018, with the epicenter at 119.86°, 0.72°. The severe shaking caused severe damage in Central Sulawesi, especially in Palu. We conducted a postseismic deformation study to determine the deformation pattern and reduce future earthquakes’ impact.Interferometric Synthetic Aperture Radar(In SAR) data were processed using Li CSBAS to get the time series. The time series data were fitted to exponential and logarithmic functions to determine the mechanism of postseismic deformation. The exponential model identified the influence of the viscoelastic mechanism, and the logarithm identified the afterslip mechanism. The Palu earthquake was fitted to logarithmic and exponential, but the logarithmic was more significant than an exponential function.Afterslip mechanism predominates, and viscoelastic mechanisms play a minor role in this postseismic deformation.展开更多
We investigated the active crustal structure in Yogyakarta,Indonesia,using new and denser Global Positioning System(GPS)data.Deformation rate estimated from five years(2013-2018)of observations on 22 campaign might re...We investigated the active crustal structure in Yogyakarta,Indonesia,using new and denser Global Positioning System(GPS)data.Deformation rate estimated from five years(2013-2018)of observations on 22 campaign might record broad deformation after the 2006 Mw7.8 Java tsunami earthquake and postseismic transient due to the 2006 Mw6.3 Yogyakarta earthquake.We conducted a decomposition method to obtain a short wavelength feature by removing those postseismic deformations from the observation data.The short wavelength pattern revealed active tectonics indicating a combination of E-W dip-slip motion and N-S left-lateral structure.A large maximum shear strain rate(>0.1 microstrain/yr)was estimated along the Opak fault while a large dilatation rate(<-0.1 microstrain/yr)was estimated around the Bantul Graben.The analysis result indicates important implications for crustal dynamics and assessing future seismic hazards potential in the Yogyakarta region.展开更多
基金partially supported by UGM’s Social Fund in the scheme of the RTA Project 2022
文摘The Palu MW7.4 earthquake occurred on September 28, 2018, with the epicenter at 119.86°, 0.72°. The severe shaking caused severe damage in Central Sulawesi, especially in Palu. We conducted a postseismic deformation study to determine the deformation pattern and reduce future earthquakes’ impact.Interferometric Synthetic Aperture Radar(In SAR) data were processed using Li CSBAS to get the time series. The time series data were fitted to exponential and logarithmic functions to determine the mechanism of postseismic deformation. The exponential model identified the influence of the viscoelastic mechanism, and the logarithm identified the afterslip mechanism. The Palu earthquake was fitted to logarithmic and exponential, but the logarithmic was more significant than an exponential function.Afterslip mechanism predominates, and viscoelastic mechanisms play a minor role in this postseismic deformation.
基金partially supported by Universitas Gadjah Mada in the scheme of Final Project Recognition.
文摘We investigated the active crustal structure in Yogyakarta,Indonesia,using new and denser Global Positioning System(GPS)data.Deformation rate estimated from five years(2013-2018)of observations on 22 campaign might record broad deformation after the 2006 Mw7.8 Java tsunami earthquake and postseismic transient due to the 2006 Mw6.3 Yogyakarta earthquake.We conducted a decomposition method to obtain a short wavelength feature by removing those postseismic deformations from the observation data.The short wavelength pattern revealed active tectonics indicating a combination of E-W dip-slip motion and N-S left-lateral structure.A large maximum shear strain rate(>0.1 microstrain/yr)was estimated along the Opak fault while a large dilatation rate(<-0.1 microstrain/yr)was estimated around the Bantul Graben.The analysis result indicates important implications for crustal dynamics and assessing future seismic hazards potential in the Yogyakarta region.
