This electronic supplement contains tables of earthquake detections, relocations, and focal mechanisms, and an animation of swarm seismicity evolution in time. See Data Processing in the main article for an additional description of these materials.
Table S1. [space-delimited plain text table; ~25 KB]. Relocations of the swarm using picks and differential travel times from waveform cross correlation. Data include the date (yr, mo, da), time (hr, mn, sec), latitude and longitude (°), depth (km), magnitude, XXXX (e1, e2, and e3), and the Southern California Earthquake Data Center (SCEDC) identification number.
Table S2. [space-delimited plain text table; ~139 KB]. Event detections and relocations using template matching. Data include date (yyyy mm dd), time (HH MM SS.SSS), latitude and longitude (°), depth (km), relocations in the x, y, and z axes (m), and magnitude.
Table S3. [space-delimited plain text table; ~7 KB]. Focal mechanisms shown in Figure 5 of the main article. Data include the event identification, date (yr, mo, day); time (hr, mn, sec); magnitude; latitude and longitude (°); depth (km); strike, dip, and rake (°); e1, fault-plane uncertainty (°); e2, auxiliary fault-plane uncertainty (°); np, number of P first-motion polarities; q, weighted percent misfit of first motions; pb, focal mechanism quality A–F; sr, probability mechanism close to solution; #SP, 100*(station distribution ratio); and AM, number of S/P ratios.
Animation S1 [h.264-encoded MP4 movie; ~7 MB]. Swarm seismicity evolution in time from 5 July 2015 to 18 July 2015, using template-detected catalog. (Top) A map view and (bottom) the north-northwest–south-southeast cross section (azimuth = 150°) are shown. Events within the 4 hr time period specified at the top are shown in color; events that occurred earlier than this time range are shown in black, with later events in white. Circles show approximate source dimensions for M >1 events, assuming a 3 MPa stress drop. Color shows the relative time within the indicated time window, with red at its leading edge transitioning through the color spectrum to blue at the trailing edge.
We used waveforms and parametric data from the California Institute of Technology (CalTech)/U.S. Geological Survey Southern California Seismic Network (SCSN; doi: 10.7914/SN/CI), stored at the Southern California Earthquake Data Center (SCEDC; doi: 10.7909/C3WD3xH1).
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