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<div><b>Fred Pollitz</b></div>
<div>U.S. Geological Survey</div>
<div>Earthquake Science Center</div>
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<div><i>Title:</i></div>
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<span style="color: rgb(200, 38, 19); font-size: 14pt;"><b>Coseismic slip and afterslip of the 2020 Magna, Utah, earthquake</b></span></div>
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<i>Abstract:</i></div>
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<p><span style="font-family:CMR10">The 2020 Magna, Utah, earthquake produced observable crustal deformation over a
</span><span style="font-family:CMSY10">бн </span><span style="font-family:CMR10">100 km</span><span style="font-family:CMR7; vertical-align:4pt">2
</span><span style="font-family:CMR10">area around the southeast margin of Great Salt Lake, but it did not produce any surface rupture. To obtain a detailed picture of the fault slip, we combine strong mo- tion seismic waveforms with GPS static offsets and
Interferometric Synthetic Aperture Radar (InSAR) observations to obtain kinematic and static slip models of the event. We sample the regional seismic wavefield with 3-component records from 68 stations of the University of Utah Seismograph Stations network.
We find that coseismic slip and afterslip, with predominantly normal slip, distributed on a shallowly west-dipping plane, possibly augmented by afterslip on a steeply northeast-dipping plane, best fits the joint dataset. The west-dipping plane locates near
previously inferred sources of interseismic creep at </span><span style="font-family:CMR10">depth. Hence the earthquake may have occurred on the downdip ex</span><span style="font-family:CMR10">tension of the Wasatch fault and activated further slip (afterslip)
at </span><span style="font-family:CMR10">shallow depth east of the hypocenter. This inferred afterslip may have </span><span style="font-size:10.000000pt; font-family:'CMR10'"></span><span style="font-family:CMR10">driven the vigorous aftershock activity
that was concentrated east of </span><span style="font-family:CMSS8"> </span><span style="font-family:CMR10">the hypocenter.</span></p>
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</span><span style="font-size:11pt; margin:0px; font-family:Arial,Helvetica,sans-serif; color:rgb(32,31,30); background-color:white">Thank you,</span><br>
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</span><span style="font-size:11pt; margin:0px; font-family:Arial,Helvetica,sans-serif; color:rgb(32,31,30); background-color:white">GHSC</span><span style="font-size:11pt; margin:0px; font-family:Arial,Helvetica,sans-serif; color:rgb(32,31,30); background-color:white"> </span><span style="font-size:11pt; margin:0px; font-family:Arial,Helvetica,sans-serif; color:rgb(32,31,30); background-color:white">Seminar</span><font style="font-size:15px; font-family:Arial,Helvetica,sans-serif; color:rgb(32,31,30); background-color:white"><span style="margin:0px; font-size:11pt"> Committee </span></font><br>
<font style="font-size:15px; color:rgb(32,31,30); background-color:white" face="Arial,Helvetica,sans-serif"><br>
</font><span style="font-size:15px; margin:0px; font-family:Arial,Helvetica,sans-serif; color:rgb(32,31,30); background-color:white"><span style="margin:0px; font-size:11pt">Francis Rengers </span></span><span style="font-size:11pt; margin:0px; font-family:Arial,Helvetica,sans-serif; color:rgb(32,31,30); background-color:white">-
frengers@usgs.gov</span></div>
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<span style="margin:0px; font-size:11pt; font-family:Arial,Helvetica,sans-serif; color:rgb(32,31,30); background-color:white">Josh Rigler - </span><span style="margin:0px; font-size:11pt; font-family:Arial,Helvetica,sans-serif">erigler@usgs.gov</span><br>
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<div style="margin:0px"><font face="Arial,Helvetica,sans-serif"><span style="margin:0px; font-size:11pt; font-family:Arial,Helvetica,sans-serif">Oliver Boyd - </span><span style="margin:0px; font-size:11pt; font-family:Arial,Helvetica,sans-serif">olboyd@usgs.gov</span></font></div>
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