Piedmont CA (Eastern suburb of Oakland) had a 4.0+ earthquake this am at 6:49 AM. The quake was felt as far away as 100 miles.
There is a really cool online resource for tracking earthquakes.
Within 40 minutes of the initial quake 1623 people from 165 different Zip Codes have already registered how it felt to them where they live and what they did (if anything).
go to:
Piedmont Earthquake Map and data from USGS online update in real time
Magnitude / Intensity Comparison
Magnitude and Intensity measure different characteristics of earthquakes. Magnitude measures the energy released at the source of the earthquake. Magnitude is determined from measurements on seismographs. Intensity measures the strength of shaking produced by the earthquake at a certain location. Intensity is determined from effects on people, human structures, and the natural environment.
This quake registered
Magnitude 4.0-4.9
Typical Maximum Modified Mercalli Intensity
IV. Felt indoors by many, outdoors by few during the day. At night, some awakened. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing motor cars rocked noticeably
V. Felt by nearly everyone; many awakened. Some dishes, windows broken. Unstable objects overturned. Pendulum clocks may stop.
8:+am 8-15-2015 Quake Intensity updated to :
VI. Felt by all, many frightened. Some heavy furniture moved; a few instances of fallen plaster. Damage slight.
Update: 8-17-2015 7:47 Wow now about 1 hours after it happened 3577 people from 199 zip codes have responded to USGA about how it was for them. First aftershock was a 2.3 at 7:14am centered in Eastern Berkeley.
2nd Update 8-17-2015 8:06
2nd aftershock same area
M2.4 – San Francisco Bay Area, California
Monday, August 17, 2015 at 14:40:11 UTC
Monday, August 17, 2015 at 07:40:11 Loca
3rd Update
as of 8:17 AM 8-17-2015 9,544 people from 239 zip codes have reported on/completed all or part of this quakes USGS survey! That's a lot of people!