IRIS WEBINAR: Evidence of Aseismic and Fluid-Driven Processes in a Small Complex Seismic Swarm Near Virginia City, Nevada, 3/18 at 2 PM ET

Danielle Sumy danielle.sumy at
Fri Mar 12 00:58:50 UTC 2021

Please register for our next IRIS Webinar on *Thursday, March 18th* at* 2:00
PM Eastern *for...

*Evidence of Aseismic and Fluid-Driven Processes in a Small Complex Seismic
Swarm Near Virginia City, Nevada*

*Presented by:* Dr. Rachel Hatch, University of Nevada - Reno, Center for
Transformative Environmental Monitoring Programs

Please register for the webinar via the link below:

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information about joining the webinar.

*Abstract:* Analysis of a small earthquake swarm near Virginia City, NV,
reveals complex structural features, including an interplay of both
fluid‐driven and aseismic‐driven earthquake migration within a naturally
occurring tectonic sequence. The Virginia City earthquake sequence occurred
over ~10 days in January 2014. We relocate 305 events to reveal three
separate, well‐defined planar structures. The earthquakes initially migrate
at a rate consistent with pore fluid diffusion, outlining a moderately
dipping plane. The earthquakes then jump to a vertical plane and migrate at
a higher rate; the sequence continues to migrate rapidly onto a third,
shallowly dipping plane, consistent with rates observed elsewhere
associated with aseismic creep. Focal mechanisms indicate right‐lateral
strike slip on the vertical plane and both normal and left‐lateral strike
slip movement on the other planes, and the newly imaged structures
illuminate the orientation of active faults at depth in the Walker Lane
tectonic region.

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