Big Shake Clusters in Mexico

By: ofieldstream , 1:25 AM GMT on March 21, 2012

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Today the ground between the states of Guerrero and Oaxaca, Mexico shook, and shook quite violently. With a huge 7.4 Quake at less than 10 miles deep, the ground was tossed mightily; we're still waiting on reports of the severity of the damage. But with a large cluster of 7 quakes from the massive 7.4 to 4.6, and all of the quakes clustered in a radius of less than 40 miles; including one offshore; there has to be some serious damage. This is also NOT an unpopulated area.

Screenshot of GoogleMap of today's WUquake MXcluster

Screenshot of USGS map of today's WUquake MXcluster

There are more, around the world. But this was a blast in a small region.

So, who's up for the next rumble? My guess the San Andreas may be feeling some shaking soon.

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6. LakeWorthFinn
6:20 AM GMT on June 25, 2012
Les, you got WU-mail...
Member Since: October 6, 2005 Posts: 68 Comments: 7585
5. clearlakemike
5:56 PM GMT on March 21, 2012
Hi Les, I heard of the earthquake (7.4) while I was driving to the beach here yesterday for a morning swim and was relieved when I heard that there was no tsunami threat for Hawaii. Last year of course, with the big Tohoku earthquake in Japan we did have a tsunami that did some significant damage along the West Hawaii Island coast. I am amazed at how many tsunami warnings we have had here the last few years or so...Chile, Japan earthquakes being the biggest potential threats. We are sort of vulnerable out here by events that are seemingly so far away.

I was curious what the fault is that runs along that part of Mexico. I know the San Andreas peters out under the Salton Sea south of Palm Springs. Found this interesting link about the tectonics of that area of the Mexican west coast. I am also wondering since it was a subduction zone type of quake if it produced at least a local tsunami. (Was out all day yesterday and haven't seen any detailed news yet about the earthquake.)

PS...interesting comment on the second page of that link about the 188 day frequency of these big quakes the last couple of years...the next date would be September 25, 2012.
Member Since: November 21, 2004 Posts: 150 Comments: 2447
4. oregonbirdofprey
3:48 PM GMT on March 21, 2012
The 3.6 off the coast of Oregon is cause for concern. Unlike California there are very few quakes in the northwest that anyone actually feels, so a false sence of security, won't happen here kind of attitude prevails at least among the general public. In fact we're due an event similar to that which struck Japan last year and possibly larger in magnitude. That event would originate in the off-shore fault and would cause at least the level of destruction seen in Japan, and we're not nearly as prepared as Japan was.
Member Since: September 26, 2008 Posts: 1 Comments: 955
3. Skyepony (Mod)
1:48 PM GMT on March 21, 2012
This morning's news looks pretty good as far people making it through this one. Amazing that bus was empty except for the driver..the only part not totally crushed.

Subway tracks..
Member Since: August 10, 2005 Posts: 299 Comments: 41208
2. ofieldstream
3:53 AM GMT on March 21, 2012
Quoting SBKaren:
So, who's up for the next rumble? My guess the San Andreas may be feeling some shaking soon.

Oh stop! As I said in your last blog - we didn't feel a thing! Of course, this was pretty far away - but also pretty big!

=:o Karen .. not my intention to scare anyone. I realize, most of those living in the shadow of the 'NBO' (Next Big ONE!) are very much aware of the potential. Just sayin' .. be extra alert. Clustered quakes are different than singles!

In just the past hour 11PM EST (GMT-5) there have been two more in the MX Cluster Group: 4.9 and 5.0; nearly on top of each other in the middle of the middle of the earlier group.

There was - in the past hour also a 3.6 off the coast of Eugene, OR.

Seismologists, Tectonics and Volcanists have said for years there is no 'regular correlation to, or pattern to, earthquakes'. I've tended to agree, mostly because I'd not really looked. Now, after watching this for over 2 years, I'm beginning to have my doubts.

Things in science change; most prominently, our understanding of LONG-TAIL conditions. Because patterns in the earth are always under change.

So .. this is why I'm making this year long marking. Truly, I hope I'm wetter'n a pond-dunked-skunk. But.. that's yet to be seen. ". )

Take care ...again, no intended pulse-push from Hoosierland. ". )))
Member Since: May 12, 2002 Posts: 161 Comments: 274
1. SBKaren
2:26 AM GMT on March 21, 2012
So, who's up for the next rumble? My guess the San Andreas may be feeling some shaking soon.

Oh stop! As I said in your last blog - we didn't feel a thing! Of course, this was pretty far away - but also pretty big!
Member Since: February 21, 2005 Posts: 200 Comments: 14832

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About ofieldstream

I am O'fieldstream, some say 'les O'fieldstream'. Either way, I am Outdoors, Photography and Technology, Writing, Travel and Friends. Love WUville.

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