A M5.7 earthquake occurred this morning and it was widely felt along the northern Wasatch Front. Numerous aftershocks have occurred and will continue. Its characteristics are consistent with the crustal extension occurring in the region (Basin and Range).
I am accumulating some links here:
- Main USGS page on the event
- University of Utah Seismo lab post Site looks like it might be pretty busy here is their main page https://quake.utah.edu/
UofU Seismo press conference
- Seismograms from AZ Broadband network (managed by SESE alum Jeri Young-BenHorin, PhD 2004)
- Seismogram plots from SESE seismologists John West and Ed Garnero
Interpretation from Garnero: "for this earthquake we get to see some natural polarization of the surface waves, since the energy comes to ASU from due North. The Love wave is shear wave that vibrates purely perpendicular to the direction the energy comes from (thus we see something on the East-West component of motion that is not really present on the North-South or Up-Down). It is named after the mathematician A.E. Love who discovered them. In contrast, the Rayleigh wave (named after Lord Rayleigh) has P-wave and shear wave energy (that is perpendicular to the Love wave-making shear wave) combined, and it is nearly purely on the vertical and N-S components. It arrives after the love wave. We don't always see such a clear separately of the surface waves."
- Watch the seismic waves roll across North America on the USArray
- Nice graphic (updated) from Chris DuRoss on the event position relative to the projection of the Wasatch Fault
- Background from Utah Geological Survey:
https://geology.utah.gov/map-pub/survey-notes/wasatch-fault-above/ (written by SESE alum Emily Kleber MS 2015; now works for Utah DNR and is out surveying the damage today)
Nice overview of the Wasatch Fault history
- Teaching/explanatory items from IRIS (note that SESE alum Wendy Bohon PhD 2014 is one of their communications leads):
Animation of Basin and Range extension measured by GPS
Normal fault animation