SEISMICITY IN THE MID-CONTINENTAL U.S. AS RECORDED BY THE EARTHSCOPE USARRAY TRANSPORTABLE ARRAY
In regions were the USArray stations have been deployed, the ANF has been able to locate about 50% more events than those reported by any other regional seismic bulletin. However, many of these could be quarry blasts that are excluded from published regional network bulletins. Within the continental US, the ANF seismic bulletin is complete to Ml ~ 2.0 and does not distinguish between earthquakes and blasts. We expect completeness of the catalog to have a higher threshold as the USArray moves eastward due to more cultural noise and deployment in softer ground. Many of the events located by the ANF in the intermontane plateaus and Appalachian regions are located near coal and metal mine operations, and given that these events occur mainly during local day-time hours suggests that they may be blasts. However, numerous events located by the ANF in the mid-continental region are tectonic. The USArray has recorded many felt minor earthquakes in Colorado, Oklahoma, Texas, Arkansas, South Dakota and Ohio as well as the swarms in Yellowstone, Oklahoma and Arkansas. Seismic picks and origins are available from http://anf.ucsd.edu.