AmerTrap.....stop staying up all night.....get some rest, man. lol2012-09-21 07:24
Yesterday was still good for 19 earthquakes, thats 4 more than our latest update yesterday. Depths were 17, 10, 21 and 10 km. All of the quakes had weak Magnitudes.
- During the latest swarm, IGN only listed earthquakes M1.5 or higher. Now that events are calming down, they have returned to a full report including the weak ones.
- 7 earthquakes listed so far today. Seismicity is back in the El Golfo area. The source for these (magmatic) earthquakes must be a fissure feeder in the crust getting resistance at a 9 to 11 km depth. The crack is currently not big enough to create more pressure as most of the earthquakes remain limited in strength.
- GPS Deformations (Dr. Sagiya)
Restinga : After a strong vertical decrease in the Ultra Rapid data yesterday, the Rapid data (improved data) made the decrease even bigger (1.5 cm to 2 cm). Today, we are up again with a few mm in the Ultra Rapid data
(Rapid data are provided many hours later). No horizontal change. We do not detect any direct relation with seismicity as the Las Calmas area had no serious seismicity during the last 24 hours.
Pinar : Deflation of approx. 1 cm. Probable reason : the central island activity started to subside yesterday and has almost completely disappeared today.
Frontera : After a strong verticcal decrease yesterday (2 cm), Frontera station was 1 cm uplifted today. This is evident, as seismicity has returned in the El Golfo area (9 to 11 km depth).
Current deformations are bad news for the people living in the El Golfo area as the process still continues below their area. There is however no direct danger as this pattern is known from the pre-swarm weeks.
Fluctuations of 1 cm up and down are fairly normal during the preceding months. In other words hard to tell whether changes are just normal fluctuations or deformations based on the current seismicity patterns.
[link to earthquake-report.com