In a previous post, TXESP discussed how Station E1TX recorded many ground motion events during a 24 hour time period. Initial observations of the EQ1 Seismograph showed a couple of events with moderate amplitudes. Analysis of the frequency spectra and additional graphs we may we have an educated interpretation to explain the recorded ground motion.
What We Know: Nearby (within 1 miles), the Texas Department of Transportation has been making repairs to an overpass bridge on Interstate 45.
What We Observe on the Raspberry Shake Seismograph We can analyze three different views of an event using the #raspishake seismogram within the SWARM software. For each event, we reviewed (a) the extracted seismogram, (b) a graph of the seismogram’s frequency spectra (frequency VS. power), and (c) a graph of the seismogram’s spectrogram (time VS. frequency). In the slideshow, these two “unknown” events are compared with an analysis of an actual magnitude M3.4 earthquake in the US Virgin Islands on January 28, 2018 at 08:17hrs UTC. Note the different characteristics (shapes) of the “unknown” events with the “known” earthquake.
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