Fig. 5: The ML6.5 Monte Cristo, NV regional earthquake (2020-05-15 11:03 UTC, 720 km distance, −160° backazimuth).
From: Remotely imaging seismic ground shaking via large-N infrasound beamforming
a Infrasound waveform. b Analysis of 17 sensors shows that the wavefield consists mainly of high-slowness secondary infrasound, except for arrivals of low-slowness primary infrasound coupled with seismic arrivals from the regional event and a subsequent local event. c Infrasound is dominated by continuous noise from two backazimuth ranges (90°–180°, and -135° to -115°), though other signals also appear. d Clusters of arrivals are visible after removing background noise and are attributed to ground shaking and other sources. e With the reduction from 17 to 3 sensors, primary infrasound from the regional earthquake is still clear but the local earthquake is not. Horizontal slowness is poorly resolved in general; unlike in (b), 3 sensors fail to detect the sustained horizontally-propagating infrasound. f The 90°−180° backazimuth range is still dominant here, but the −130° to −110° range is not visible. The features seen in (b) are less visible. g The features that were obvious in (d) are unresolvable.
