[Island Chris]

Good morning all,
The USGS map is showing a M3.3 in easternmost Connecticut in the last your. We should wait and see if it is real, but M3+ are quite rate around Rhode Island (where I live). There is no focal mechanism yet and there probably will not be one on the USGS page, but I'll guess the mechanism with show an ENE-WSW P axis, and it may be thrust (or strike-slip). The link is to the largest historic earthquake in that state (east of New York City)

http://connecticuthistory.org/largest-ea...ry-may-16/

Chris

[Island Chris]

I typed the wrong thing for the subject. Now that it has been a few hours, seems it was indeed a quakes.

Chris

[Skywise]

(01-12-2015, 08:41 PM)Island Chris Wrote: I typed the wrong thing for the subject. Now that it has been a few hours, seems it was indeed a quakes.

Chris

I fixed the subject for you. One of the reasons I wanted to switch software was to make these kind of errors easily fixable. Took me all of five seconds.

I wonder how big that 1791 quake was. Sounds like it was in the 5's. And if there was surface rupture, shallow. USGS has it listed as intensity VII.

http://earthquake.usgs.gov/earthquakes/s..._05_16.php

The wikipedia entry also mentions an intensity VI quake in 1568.

http://en.wikipedia.org/wiki/Moodus,_Connecticut
http://earthquake.usgs.gov/earthquakes/s...s/1568.php

Brian

[Island Chris]

The Connecticut swarm was on CBS news last night (as well as the Iceland volcano; I'll post that on that thread. See the link. And, for a small game, find the bad error on the video part, assuming the video part is the same as what was on TV. The quakes have been felt and also heard as explosions. Sounds like the big one was reverse or thrust quake as I expected, but this was not stated clearly.

http://www.cbsnews.com/news/connecticut-...in-1-week/

Chris

[zinnanti]

Between the lower midwest, northwest and northeast, it seems like there is overall an increase is seismic events over the last few years. Is this the case?

[Island Chris]

Tony,
There has been a massive increase in seismicity in Oklahoma the last couple of years, especially in 2014, which is almost certainly related to injection wells used to get rid of fluid used for fracking. There has also been extra seismicity in Texas and Kansas. A couple of/few years ago there was a lot of seismicity in Arkansas. Part of this was probably related to an injection well. The two recent M3+ quakes were in eastern Connecticut and the Gulf of St Lawrence, Canada (M4+). Pretty sure there is no fracking there. Injections wells exist for other reasons, but I suspect those quakes were not triggered by man.

Chris