2020 M7.4 La Crucecita, Oaxaca earthquake

Diego Melgar, University of Oregon

This kinematic slip inversion is constrained by 1Hz GNSS data from the TLALOCNet network as well as by line of sight measurements from Sentinel 1A/1B ascending track 107 and descending track 070. It also includes one tsunami record from DART buoy 43413 and observations of coseismic uplift at one tide gauge station (HUAT). The fault geometry is from Slab 2.0 and has been discretized into triangles with roughly 5km per side with a finite element mesher.

GNSS data was processed by Brendan Crowell at the University of Washington. InSAR by Xiaohua Xu at UC San Diego

The tsunami model for this earthquake is here

Slip model

Fits to HR-GNSS waveforms

Fits to tsunami at DART buoy

Fits to ascending and descending InSAR

Event source time function

Misfit as a function of maximum allowed rupture speed

Predicted vertical deformation (tsunami initial condition)