Earthquake overview : Very strong dangerous aftershock in Guerrero Mexico with an epicenter close to the epicenter of the massive March 20 M 7.4 earthquake.
“I have Felt it” Reports –> see below + Let us know “how you have felt this earthquake”
To read the full story as it happened, we advise our readers to start at the lower part of the page (earthquake data).
With the contributions of Carlos Robles
Read also : Earthquake in Guerrero – Oaxaca, Mexico – 2 people died after Tuesday’s earthquake
Keep this page open or return regularly as we will be back with more details when they become available
Update 13/04 – 13:32 UTC
2 serious aftershocks in Guerrero / Oaxaca, Mexico
As predicted several weeks ago, the M7.6 earthquake in Guerrero Mexico would surely lead to a lot of aftershocks including some stronger ones which will be close or greater than M6.0. What happened today (M5.4 at 10:10 UTC and M5.3 at 13:06 UTC) could be expected and will normally not cause any additional damage. Let us hope that the aftershocks will gradually winding down in strength and number.
Update 03/04/2012 – 17:49 UTC :
As we are constantly monitoring the local situation, ER contributor Carlos Robles reports that yesterday’s aftershock caused light damage in Chilpancingo. The city of Chilpancingo reports damage at the cathedral of Asuncion de Maria that was damaged by the previous earthquake. Other places also suffered damage like construction zones and a mall.
Update 03/04/2012 – 16:11 UTC :
We are happy to report that we could not find any trace of serious damage or injuries after this earthquake.
- the early alert system in Oaxaco (SASO) has gone off seconds before the tremor could be felt. At earthquake-report.com we think that this kind of early alarms is only giving a false sign of security if the epicenter is below land. In case of a very powerful earthquake which may be damaging in a radius of 100 to 150 km, the damaging shear wave will be arriving within seconds. People might try to evacuate in the meantime leaving a far better location for an emergency pathway. A lot of them will be located in the stairway of apartment and office blocks, being at the most vulnerable place of the building.
Is there no real advantage at an early alarm ? : oh yes, to bring elevators to an emergency stop, trains and subway emergency stops etc. and to warn for possible tsunami waves if the epicenter is out in the sea. People in Guerrero have the final word in this case.
We see almost continuously infringements against the safety rule number 1 : drop, cover and hold. Click here for our in-depth article and how to behave during and after an earthquake.
- A lot of tourists have not even felt the earthquake in Acapulco
- In Tlaxcala NO damage had been reported
- In Guerrero, 12,000 houses were seriously damaged during the March 20 mainshock. 2,400 houses will have to be reconstructed completely. The other houses are partially damaged.
- The National Fund for Natural Disasters (Fonden) will help the families in Guerrero
Update 23:58 UTC : USGS has again updated the earthquake data. The (probably) final values are M6.0 at a depth of 9.1 km. These values are far better and less dangerous than their previous calculations. With the new data, there might be a possibility that almost no damage will be inflicted. So far NO reports of damage or injuries
- the area is hit by numerous aftershocks in the M4 to M5 range
Update 20:28 UTC : The authorities in Puebla, one of the major Mexican cities and approx. 250 km from the epicenter, have reported NO injures or damage. Good news which we expected at this distance.
Earthquake-report.com calls an area with a radius of about 35 km around the epicenter at high risk for additional damage (to the already damaged houses during the March 20 mainshock).
Update 19:44 UTC : USGS has increased his intensity mapping prediction. The new estimate mention 17,000 people having felt a severe MMI VIII shaking (damaging environment), 180,000 people a VII MMI very strong shaking.
The new values are bad news and will make this aftershock almost certain a damaging one.
Until now we have No details yet on damage and injuries. As said earlier it will take another 2 to 6 hours to have see first serious assessments of the epicenter area
Update 19:42 UTC : Intensity report in the most important cities in the greater epicenter area :
VII Cuajinicuilapa 9,000 people
VII San Juan Cacahuatepec 4,000 people
VII Ometepec 18,000 people
VII San Pedro Amuzgos 4,000 people
VI San Pedro Jicayan 4,000 people
VI Santiago Pinotepa Nacional 26,000 people
MMI VII : very strong shaking
MMI VI : strong shaking
Update 19:16 UTC : Mexican authorities are reporting the strongest shaking in the Costa Chica region. Until now, we have no reports of damage, but we are almost sure that they will appear in 4 to 8 hours.
Update 18:38 UTC : Helicopters were dispatched 5 MINUTES after the earthquake. The only damage seen was a billboard that fall causing NO injuries. (we are confirming the very swift reaction of the authorities in DF)
Update : The Mexican seismological agency has increased his initial Magnitude to 6.0. Since the mainshock today, 2 aftershocks of resp. 4.6 and 4.7 have been listed (normal)
Update : Read also the many felt reports at the bottom of this page
Update 18:29 UTC : Last time, damage was only reported after several hours or even a couple of days in the epicenter area (one of the poorest areas in Mexico). Most houses are made from brick or in adobe in the greater epicenter area.
- Security secretary of Mexico City reports that there is NO damage.
- Communications are still working.
- Subway is still working.
Such reports are mostly based on the capital Mexico City or DF.
Update : Intermediate report from Carlos Robles : Servicio Sismologico Nacional is upgrading the earthquake to 6.0. Saldo blanco (no deaths) is reported. There aren’t reports of damage.
Update 18:23 UTC : There are NO Nuclear plants or Hydrodams in the greater epicenter area
Update : EMSC (Seismology Europe) reports now a magnitude of 6.1 at a depth of 10 km
Update 18:18 UTC : NO tsunami danger as the epicenter of the earthquake is below the Mexican mainland
Update : Evacuation were held at Mexico city.It was felt strong in some parts of Mexico city.In Coyoacan there are only reports of scared people. (source : Carlos Robles)
Update : USGS predicts a very strong shaking for 3,000 people in the epicentral area. 164,000 people will have experienced a strong MMI VI shaking and 289,000 people a moderate shaking. As this earthquake is also felt in DF, the earthquake will have been noticed by millions of people.
Update : As this is an aftershock from the March 20 M 7.4 earthquake, these aftershocks, even at the current magnitude are very normal !
Update : The president of DF is flying by helicopter over DF areas to overview the situation. He reports that so far no serious damage can be seen from the air
Update : The Mexican media including the local seismological agency are not reachable because of too many connections
Update : The mainshock, which happened at March 20 was the 4th deadly earthquake this year
Update : 27 km (17 miles) SSE (148°) from Ometepec, Guerrero, Mexico
This aftershock can further damage already damaged houses in Guerreo
Epicenter also in Ometepec
EMSC reports a Magnitude of 5.7 at a depth of 40 km (preliminary)µ
The earthquake has been felt as far as Mexico City DF
Based on our experience we expect further damage in Guerrero but no damage elsewhere in the country
We will start an in-depth article soon as USGS is reporting a magnitude of 6.3 at the very shallow depth of 12 km. Potentially very damaging
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“I Have Felt It” reports as received by Earthquake-Report.com
See below for all the received Earthquake Experience reports as received by earthquake-report.com
Most important Earthquake Data:
Magnitude : 6.3
UTC Time : Monday, April 02, 2012 at 17:36:43 UTC
Local time at epicenter : Monday, April 02, 2012 at 12:36:43 PM at epicenter
Depth (Hypocenter) : 12 km
27 km (17 miles) SSE (148°) from Ometepec, Guerrero, Mexico
Links to important maps
USGS Did You Feel It Map
Google satellite map showing the epicenter and the surrounding area
Historic earthquakes map
Seismic hazard map
Focal mechanism report
Human impact map
GDACS earthquake report
I Have Felt this earthquake
|USGS||Guerrero, Mexico||Apr 02 23:55 PM||4.9||56||MAP I Felt It|
|EMSC||Guerrero, Mexico||Apr 02 23:55 PM||5.0||33||MAP I Felt It|
|GEOFON||Near Coast Of Guerrero, Mexico||Apr 02 23:55 PM||4.8||10||MAP I Felt It|
|EMSC||Guerrero, Mexico||Apr 02 19:38 PM||4.6||40||MAP I Felt It|
|GEOFON||Near Coast Of Guerrero, Mexico||Apr 02 19:38 PM||4.5||10||MAP I Felt It|
|USGS||Oaxaca, Mexico||Apr 02 19:38 PM||4.6||10||MAP I Felt It|
|GEOFON||Guerrero, Mexico||Apr 02 18:39 PM||4.3||15||MAP I Felt It|
|EMSC||Oaxaca, Mexico||Apr 02 18:39 PM||4.5||20||MAP I Felt It|
|USGS||Oaxaca, Mexico||Apr 02 18:39 PM||4.5||10||MAP I Felt It|
|EMSC||Off Coast Of Jalisco, Mexico||Apr 02 18:28 PM||4.7||40||MAP I Felt It|
|USGS||Off The Coast Of Jalisco, Mexico||Apr 02 18:28 PM||4.7||10||MAP I Felt It|
|GEOFON||Off Coast Of Jalisco, Mexico||Apr 02 18:28 PM||4.6||10||MAP I Felt It|
|GEOFON||Near Coast Of Guerrero, Mexico||Apr 02 18:26 PM||4.4||10||MAP I Felt It|
|GEOFON||Near Coast Of Guerrero, Mexico||Apr 02 18:17 PM||4.5||10||MAP I Felt It|
|USGS||Guerrero, Mexico||Apr 02 18:17 PM||4.8||10||MAP I Felt It|
|EMSC||Guerrero, Mexico||Apr 02 18:17 PM||4.8||10||MAP I Felt It|
|GEOFON||Near Coast Of Guerrero, Mexico||Apr 02 18:07 PM||4.4||10||MAP I Felt It|
|EMSC||Guerrero, Mexico||Apr 02 17:36 PM||6.0||10||MAP I Felt It|
|USGS||Oaxaca, Mexico||Apr 02 17:36 PM||6.0||9||MAP I Felt It|
|GEOFON||Near Coast Of Guerrero, Mexico||Apr 02 17:36 PM||6.0||10||MAP I Felt It|
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