Abstract
AbstractThe three‐dimensional (3‐D) deformation field associated with the 2016 Central Tottori earthquake is retrieved from advanced land observing satellite 2 interferometric synthetic aperture radar (InSAR) observations with four different viewing geometries, that is, ascending/descending tracks and left‐/right‐looking modes. The strain model and variance component estimation (SM, VCE, SM‐VCE) method is exploited and improved to integrate the InSAR observations with different viewing geometries so that the 3‐D deformation field is not affected by the inconsistent coverage of SAR footprints or the gross errors in InSAR observations. The obtained results are consistent with GNSS observations, indicating that the improved SM‐VCE method, known as SM‐RVCE in this paper, is capable of retrieving an accurate and spatially complete 3‐D deformation field for this earthquake. In addition, the precision of the InSAR observations and the estimated 3‐D deformation are quantitatively assessed by the SM‐RVCE method. Finally, on the basis of the estimated 3‐D coseismic deformation, the source parameters of this event are inverted, revealing an asperity with a maximum strike‐parallel slip of ~1.1 m concentrated at depths between 2 and 10 km. The estimated seismic moment is 2.4 × 1018 Nm, which corresponds to a Mw 6.2 event.
Highlights
At 05:07:22 (UTC) on 21 October 2016, an earthquake of magnitude 6.6 determined by the Japan Meteorological Agency (MJMA6.6) struck Central Tottori Prefecture (Zhao et al, 2018), Western Honshu, Japan
The three‐dimensional (3‐D) deformation field associated with the 2016 Central Tottori earthquake is retrieved from advanced land observing satellite 2 interferometric synthetic aperture radar (InSAR) observations with four different viewing geometries, that is, ascending/descending tracks and left‐/ right‐looking modes
The spatially complete 3‐D deformation field associated with the 2016 Central Tottori earthquake is derived from only InSAR LOS measurements with four distinct viewing angles (i.e., ascending left‐looking (AsL), ascending right‐looking (AsR), descending left‐looking (DesL), and descending right‐looking (DesR)) using the SM‐RVCE method
Summary
At 05:07:22 (UTC) on 21 October 2016, an earthquake of magnitude 6.6 determined by the Japan Meteorological Agency (MJMA6.6) struck Central Tottori Prefecture (Zhao et al, 2018), Western Honshu, Japan. Interferometric synthetic aperture radar (InSAR), characterized by its high spatial density of measurements, large spatial coverage, and high measurement accuracy, has been widely used in the monitoring of ground surface deformation (Bawden et al, 2001; Fialko et al, 2005; Funning, Barke, et al, 2005; Gabriel et al, 1989; Goldstein et al, 1993; Hilley et al, 2004; Massonet et al, 1995; Massonnet et al, 1993) This technique can capture only one‐ dimensional deformation along the line‐of‐sight (LOS) direction. The measurements from the pixel offset tracking (POT) (Michel et al, 1999) and multi‐aperture InSAR (MAI) (Bechor & Zebker, 2006; Jung et al, 2009) techniques, typified by the complementary azimuth direction but an ungraded accuracy, can be integrated with InSAR LOS measurements to obtain significant 3‐D surface deformation generated by geophysical events, such as earthquakes
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
