This electronic supplement contains figures showing uninterpreted seismic reflection profiles.
Figure S1. (a) Uninterpreted line 19 (Fig. 3 of the main article; 2010 sparker multichannel seismic [MCS] data) is the northernmost line in this study. (b) Uninterpreted line 7 (Fig. 3 of the main article; 2011 generator-injector [GI] gun MCS data) is offshore of Salt Creek. Layers thicken and dip to the east, with the dip increasing with depth (i.e., divergent). The trend is persistent to the bottom of the profile, a depth of 1.8 s two-way travel time (TWTT).
Figure S2. Uninterpreted 2010 sparker MCS data. Line 17 is located offshore slightly north of Durmid Hill. Layers thicken and dip to the east. Gas is present on the southwestern and northeastern edges of the line. To the northeast, surficial reflectors appear to dip and thicken to the southwest toward a potential fault structure (Salton trough fault [STF]). Location is shown in Figure 1 of the main article.
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