Magnitude --> Ground Acceleration
Magnitude --> Ground Acceleration
(OP)
Last Friday there was an earthquake in the New Madrid fault zone with a duration magnitude of 4.5. Information about the quake can be found at this website.
http://neic.usgs.gov/neis/bulletin/neic_usay.html
I have a few jobs at Fort Campbell, KY which is about 160 miles from the epicenter. I am wondering what the ground acceleration was at Fort Campbell due to this quake. I have found, from the link above, several seismographs from various locations in the area. The vertical scale though is in microvolts, not acceleration units. Does anyone know how to determine the ground accelerations?
Thanks,
Shemp
http://neic.usgs.gov/neis/bulletin/neic_usay.html
I have a few jobs at Fort Campbell, KY which is about 160 miles from the epicenter. I am wondering what the ground acceleration was at Fort Campbell due to this quake. I have found, from the link above, several seismographs from various locations in the area. The vertical scale though is in microvolts, not acceleration units. Does anyone know how to determine the ground accelerations?
Thanks,
Shemp





RE: Magnitude --> Ground Acceleration
Its been that way for a long time. And here in the Midwest (I'm in St. Louis, MO) we're not much closer to having a network of strong motion accelorometers here. I know of only one in recent history and that is presently being installed on the new cable stay bridge in Cape Girardeau, MO.
California has recently begun a program to install strong motion recorders and keep a database of records. It is COSMOS and was headed up by long-time seismologist Bruce Bolt.
RE: Magnitude --> Ground Acceleration
On the University of Memphis CERI website, they have a list of seismograph stations. At this link,
http://folkworm.ceri.memphis.edu/STATIONS/
it looks like there are a lot of strongmotion sensors. Do you think that these stations were able to measure the quake accurately?
Do you know of any websites that have accelerometer data showing absolute ground motion accelerations?
Thanks,
Shemp
RE: Magnitude --> Ground Acceleration
RE: Magnitude --> Ground Acceleration
I didn't see anywhere on the list of strong motion sensors where the data is available.
Regarding the weigh station, its important to have the sensor somewhere its not going to be tampered with. As for the truck induced vibrations this would likely be low and can certainly be filtered out.
Incidentally, I've not heard of the duration magnitude before. Could you elaborate.
I noticed that the Moment magnitude of this quake was reported at Mw = 4.0 so a little lower than the 4.5 reported earlier. The latter may have been a local magnitude. The moment magnitude will give an actual correlation to the amount of energy associated with that quake.
RE: Magnitude --> Ground Acceleration
http://earthquake.usgs.gov/recenteqsUS/glossary.htm#mag