Electronic Supplement to
Rapid Characterization of the 2015 Mw 7.8 Gorkha, Nepal, Earthquake Sequence and Its Seismotectonic Context

by Gavin P. Hayes, Richard W. Briggs, William D. Barnhart, William L. Yeck, Daniel E. McNamara, David J. Wald, Jennifer L. Nealy, Harley M. Benz, Ryan D. Gold, Kishor S. Jaiswal, Kristin Marano, Paul S. Earle, Mike G. Hearne, Greg M. Smoczyk, Lisa A. Wald, and Sergey V. Samsonov

Table S2. Summary of fault slip model geometries for the April 25 mainshock and May 12 aftershock detailed in this study

Event Model* Strike (°) Dip (°) Rake (°) Depth to Top of Fault Plane (km) Depth to Center of Fault Plane (km) Longitude1 (°) / Latitude1 (°) † Longitude2 (°) / Latitude2 (°) † RMS (m)
25 April Mainshock SP-U 289 32 77 18.5 23.0|| 85.918/27.5897 84.901/27.8843 0.135
SP-C 290 7 99 14.9 16.5|| 85.9265/27.5866 84.8828/27.9156 0.169
DS-U 289 32 Free 1.75 23.0 86.2869/27.2268 84.3617/27.7846 0.201
DS-C 290 7 Free 10.4 16.5 86.2328/27.1363 84.3254/27.7375 0.138
12 May Aftershock aSP-U 287 12 99 12.1 13.7|| 86.2171/27.6433 85.9529/27.7141 0.062
aSP-C1 288 9§ 99 12.0 13.4|| 86.2161/27.6443 85.9512/27.7186 0.060
aSP-C2 309§ 9§ 122 13.2 14.5|| 86.1476/27.6345 85.9641/27.7647 0.061
aDS-U 287 12 99§ 9.7 13.7 86.4396/27.4760 85.6634/27.6840 0.104
aDS-C1 288 9§ 99§ 10.3 13.4 86.4355/27.4755 85.6625/27.6923 0.106
aDS-C2 309§ 9§ 122§ 9.8 14.5 86.3149/27.2657 85.5223/27.8276 0.107
aDS-C3 290 7 120§ 10.4 16.5 86.2328/27.1363 84.3254/27.7375 0.106

All models are derived from geodetic observations (Table S1). All models are a single fault plane with
uniform strike and dip. Fixed rake (slip direction) value is shown where applicable. Free rake inversions
allow for thrust, right-lateral, and left-lateral slip (no normal-type motion).

*Models: italic indicates preferred model (Fig. 2 in the main article); SP, single patch model with uniform slip; DS, distributed slip model; U, geometry is unconstrained; C, geometry is constrained. Model aDS-C3 of the
May 12 aftershock is the same as model DS-C of the mainshock.

†Longitude/Latitude indicates the vertices of the top of the fault plane.

‡RMS is the root mean squared misfit between the predicted model and observed surface displacements.

§Dip is fixed.

||Depth is equivalent to centroid.

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