Buoys 21401 (Kuril Islands), 43413 and 46419 in event mode - M7.9 Guerrero, Mexico

21401, 250 NM Southeast of Iturup Island now in tsunami event mode.

Iturup is the northernmost island in the southern Kuril/Chishima islands.

In 1963, the area experienced a M8.5 eq, in 2006 a M8.3 and in 2007 a M8.1.

Per Wikipedia, "The Kuril Islands form part of the island arc formed above the subduction zone, where the Pacific Plate is being subducted beneath the Eurasian Plate. This convergent boundary has been the site of many large megathrust earthquakes."






















Recent earthquakes in the region:


Biggest earthquakes in the region:


[Added by the Moderation]

Comment by Recall15 ( http://poleshift.ning.com/profiles/blogs/earthquakes-worldwide)

USGS said it was 7.9 at Guerrero MX:

Magnitude 7.9 - GUERRERO, MEXICO
2012 March 20 18:02:53 UTC




Comment by Saanvi ( http://poleshift.ning.com/profiles/blogs/earthquakes-worldwide)

March 20, 2012 — A major earthquake has hit Oaxaca, Mexico.

The U.S. Geological Survey (USGS) has reported a 7.6-magnitude earthquake in Oaxaca, Mexico, about 200 km east of Acapulco.

The quake was originally thought to be a 7.9 but has since been downgraded. It struck the area at 18:02 GMT.




Plot of Water Column Height Data for Station 43413

-- Plot of 15-second data --
Plot of Water Column Height 15-second Data for Station 43413

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Comment by Fea on March 21, 2012 at 6:44am

@David - the first of many

Comment by David on March 21, 2012 at 6:41am

Se deforman vías del Metro

Subway, Mexico city. Source: La Jornada.

Comment by Recall 15 on March 21, 2012 at 6:35am

A missing event in Buoy 43412 360 NM South-Southwest of Acapulco, Mexico

2012 03 20 21 46 00 2 3404.022
2012 03 20 21 45 00 2 3404.026
2012 03 20 21 44 00 2 3404.026
2012 03 20 21 43 00 2 3404.028
2012 03 20 21 42 00 2 3404.030
2012 03 20 21 41 00 2 3404.030
2012 03 20 21 40 00 2 3404.032

From Direct Link:


Comment by Howard on March 21, 2012 at 6:33am

@ Jack Johnson - Accelerometers or inclinometers on board the buoys measure the heave acceleration or the vertical displacement of the buoy hull during the wave acquisition time. The Bottom Pressure Recorder has a tsunami detection algorithm on board that places the tsunameter in Event Mode.  Event Mode reports events such as earthquakes and /or tsunamis when a detection threshold is exceeded. The tsunami detection algorithm triggers when measured and predicted values differ by more than the threshold value. Event Mode provides data more frequently - an initial 4 minutes of 15-second with one-minute averaged data for the hour before and the three hours after going into Event Mode.  Source

Comment by Howard on March 21, 2012 at 2:59am

800 Homes Damaged Near Quake Epicenter -

MEXICO CITY (AP) - A strong 7.4-magnitude earthquake hit southern Mexico on Tuesday, damaging some 800 homes near the epicenter and swaying tall buildings and spreading fear and panic hundreds of miles away in the capital of Mexico City.

One of the strongest to shake Mexico since the deadly 1985 temblor that killed thousands in Mexico City, Tuesday's earthquake hit hardest in border area of southern Oaxaca and Guerrero states. In Guerrero, officials confirmed that some 800 homes had been damaged, with another 60 having collapsed.  More

Comment by Malou (Marie Louise) Geleff on March 21, 2012 at 2:25am

lots of rock´n´roll !  

Comment by Carlos on March 21, 2012 at 1:52am

Comment by Fea on March 21, 2012 at 12:54am

Mod Staff - much appreciation for the additions.

Comment by Howard on March 20, 2012 at 11:57pm

Station 46419 (off Seattle) still restless:

Comment by Recall 15 on March 20, 2012 at 7:27pm

Now Buoy 43413 is Active:

- 360 NM South-Southwest of Acapulco, Mexico

From Direct Link:


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