Archive for August, 2014

M4.8 – 44km ESE of Middleton Island, Alaska – August 27, 2014

August 27, 2014

Alaska_08272014USGS Tectonic Summary

2014-08-27 06:10:19 UTC
Magnitude 4.8, Alaska
59.222°N   -145.573°W
Depth:  12.3km


M6.9 – 43km ENE of Tambo, Peru – August 24, 2014

August 25, 2014

CA_08242014USGS Tectonic Summary

2014-08-24 23:21:45 UTC
43km ENE of Tambo, Peru
-14.586°S   -73.578°W
Depth: 101.0km
Magnitude: 6.9

Magnitude 6.0 – 6km NW of American Canyon, California – August 24, 2014

August 25, 2014


USGS Tectonic Summary
Magnitude 6.0, California
2014-08-24 10:20:44 UTC
38.220°N   -122.313°W
Depth:  11.3km

Click below for excellent analysis of the Napa, California quake by IRIS and seismologists at UC, Berkeley:

USGS report of shaking felt across San Francisco area of Northern California
Because of differences in the crust of the Eastern US vs. that of Western US, earthquake waves travel more efficiently in the East than in the West. So, a magnitude 6 quake in the West is felt (and damaging) over a much smaller area than an earthquake of the same magnitude in the East (see below). Today’s Northern California quake is the one shown in the lower right.