Version 2Scientific AnalysisUpdated model after grid searching for best fit fault geometry and improving P wave fits.Data Process and Inversion
We analyzed 44 teleseismic broadband P waveforms, 27 broadband SH waveforms, and 62 long period surface waves selected based on data quality and azimuthal distribution. Waveforms are first converted to displacement by removing the instrument response and are then used to constrain the slip history using a finite fault inverse algorithm (Ji et al., 2002). We begin modeling using a hypocenter matching or adjusted slightly from the initial NEIC solution ( location = 7.6°N, 80.8°W; depth = 12.6 km ), and a fault plane defined using either the rapid W-Phase moment tensor (for near-real time solutions), or the gCMT moment tensor (for historic solutions).
Result
This result is based on the moment tensor nodal plane ( strike = 288.0°; dip = 50.0° ). The seismic moment release based upon this plane is 3.9e+20 N-m (Mw = 7.7) using a 1D crustal model interpolated from CRUST2.0 (Bassin et al., 2000).
Cross-section of Slip Distribution
Cross-section of slip distribution. The strike direction is indicated above each fault plane and the hypocenter location is denoted by a star. Slip amplitude is shown in color and the motion direction of the hanging wall relative to the footwall (rake angle) is indicated with arrows. Contours show the rupture initiation time in seconds.Surface Projection
Surface projection of the slip distribution superimposed on GEBCO bathymetry. Thick white lines indicate major plate boundaries [Bird, 2003]. Gray circles, if present, are aftershock locations, sized by magnitude.View finite fault mapMoment Rate Function
Source time function, describing the rate of moment release with time after earthquake origin, relative to the peak moment rate (listed in the top right corner of the plot). The red dashed line represents the interpreted end of the event.
We analyzed 44 teleseismic broadband P waveforms, 27 broadband SH waveforms, and 62 long period surface waves selected based on data quality and azimuthal distribution. Waveforms are first converted to displacement by removing the instrument response and are then used to constrain the slip history using a finite fault inverse algorithm (Ji et al., 2002). We begin modeling using a hypocenter matching or adjusted slightly from the initial NEIC solution ( location = 7.6°N, 80.8°W; depth = 12.6 km ), and a fault plane defined using either the rapid W-Phase moment tensor (for near-real time solutions), or the gCMT moment tensor (for historic solutions).
Result
This result is based on the moment tensor nodal plane ( strike = 288.0°; dip = 50.0° ). The seismic moment release based upon this plane is 3.9e+20 N-m (Mw = 7.7) using a 1D crustal model interpolated from CRUST2.0 (Bassin et al., 2000).
Cross-section of Slip Distribution
Cross-section of slip distribution. The strike direction is indicated above each fault plane and the hypocenter location is denoted by a star. Slip amplitude is shown in color and the motion direction of the hanging wall relative to the footwall (rake angle) is indicated with arrows. Contours show the rupture initiation time in seconds.Surface ProjectionSurface projection of the slip distribution superimposed on GEBCO bathymetry. Thick white lines indicate major plate boundaries [Bird, 2003]. Gray circles, if present, are aftershock locations, sized by magnitude.View finite fault mapMoment Rate Function
Source time function, describing the rate of moment release with time after earthquake origin, relative to the peak moment rate (listed in the top right corner of the plot). The red dashed line represents the interpreted end of the event.
IP属地:福建
48楼2026-10-10 08:14
48楼2026-10-10 08:14收起回复
