Earthquake overview : A very strong ridge earthquake has hit the sea floor of the Gulf of California. The shaking will be extended onto the coastal areas like the Mexican continent and Baja California peninsula
“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).
Check also our Mexico-only earthquake list
Keep this page open or return regularly as we will be back with more details when they become available
Update 13/04 – 16:04 UTC
A local Guaymas newsletter (Autónomo) reports damage to 2 schools and a house in Empalme. Empalme is more than 150 km from the epicenter !
Update 13/04 – 09:54 UTC
The staff of Civil Protection, Urban Infrastructure and SIUE (Ministry of Urban Infrastructure and Ecology) is conducting currently an inspection in the Guaymas area (150 km from the epicenter).
The local head of Civil Protection, Leon Gerardo Soto reported that home owners in the greater Guaymas area have calles the Civil Protection to report damage on their houses.
Regarding the City Hall (Palacio Municipal), he said that new cracks were found at the main entrance.
Update 21:12 UTC
* Cracks on walls in Guaymas, Sonora : People were calling newspapers and local media to report damages in their houses. El Palacio Municipal (Municipal Palace ,local government building) reported cracks on the principal entrance.
* Mexican Proteccion Civil has evacuated people from the beach as a precautionary measure
- Update 17:17 UTC
* At least 60 Americans have asked their touring companies to be transferred away from their vacation location at Bahía de Kino.
* Proteccion Civil Mexico has reported that they have had NO reports of damage or injuries in Guerrero Negro. One of the main reasons that this earthquake will have been harmless may have been the short duration of the shaking (10 seconds in Hermosilla)
- An ER reader living in Tucson, Arizona (USA) mentioned having felt the earthquake !
- Since the mainshock, the earthquake area has been hit by 6 aftershocks varying in strength in between M3.7 and M4.8.
- The earthquake was felt strongly. There have been 2 confirmed reports in San Luis of a VI intensity (72km from the epicenter). This means that there is the potential for VII-VIII in the epicentral area (damaging). (we are choosing to ignore a response of VII, which came 354km from the epicenter).
- Historic damaging earthquakes of similar magnitude have occurred once in the epicentral region with a M7.0 earthquake in 1954 causing no deaths and minor damage. This is a good sign for the region affected.
- Looking at the epicentral area – the location is very sparsely populated with only a few houses along the coastline apart from Santa Isabel.
- Mexican hypocenter (UNAM) is at M6.8 and 10km depth, under land.
- USGS hypocenter is at M6.9 and off the coast – there is little chance of a tsunami due to the fault mechanism.
- The area around Santa Isabel is most at risk from the USGS-based hypocenter with a possible shaking of VII. Some damage should be expected. Currently Agua de Soda and other towns closeby near the national park of Baja California are most at risk from the Mexican hypocenter which is below land.
- The Mexican Civil Defense who is responsible for Search and Rescue and first aid has reported that so far NO damage or injuries has been recorded.
- Based on the Geofon data both earthquakes were strike-slip earthquakes (mainly lateral movement).
- The average shaking recorded in Hermosilla is MMI IV (based on 84 reports). The shaking in Guerrero Negro is MMI V (moderate). Hermosillo is 10. km from the epicenter and Guerrero Negro 133 km. As explained before our attention goes to the immediate area of the epicenter (very shallow earthquake) – 30 to 40 km radius is at risk for eventual damage. Whether there will be damage or not will depend on how long both shakings have lasted and on the final earthquake data numbers.
- As the earthquake struck in a coastal area, NOAA has written in his latest report (for USA people mainly) : A strong earthquake has occurred, but a tsunami IS NOT expected along the California, Oregon, Washington, British Columbia, or Alaska coast. NO tsunami warning, watch or advisory is in effect for these areas. Based on the earthquake magnitude, location and historic tsunami records, a damaging tsunami IS NOT expected along the California, Oregon, Washington, British Columbia, and Alaska coasts.
- The earthquake happened just after midnight. Mexican news channels haven’t picked up the news yet. Of course it is in the middle of the night in Mexico and people seem to have been used to the many earthquakes of the last 24 hours.
- The set of earthquakes in the Gulf of California have started with a M4.7 earthquake, followed 18 minutes later by a M6.2 earthquake and another 9 minutes later with a M6.9 earthquake (the most powerful so far)
- USGS has calculated that 3000 people will have experienced a very strong shaking and that 105,000 have experienced a strong shaking. Both these areas are at risk for eventual damage, especially because 9 minutes earlier another very strong earthquake struck the same area.
- The Mexican Servico Sismologico Nacional reports a magnitude of 6.8 with an epicenter below land. These makes this earthquake the most dangerous in 24 hours !
- Although it is a ridge earthquake, the epicenter of the M6.9 quake looks to be very close to the coast which makes this earthquake (the second very strong in a matter of 9 minutes) EXTREMELY DANGEROUS for shaking damage and fatalities. Let us hope that we are too pessimistic here. The kind of shaking will depend on the focal mechanism
- Following calculations by the USGS (providing that the earthquake data are correct) a MMI VII will have been experienced on the Baja California peninsula ! This means dangerous for the coastal areas experiencing this kind of shaking.
- The whole North American continent is currently moving in such a way that the earthquakes of the last 12 hours are somehow related (Mexico Sur, Mexico Gulf of California, Utah, Oregon) . Scientists will have a lot of work in examining eventual relationships however there is no certainty at all that a relation would exist (at least for a couple of these earthquakes)
- We are talking in this case about a Ridge earthquake, this means 2 separating plates who are hanging and suddenly get away from each other. Ridge earthquakes are typical for Middle Ocean locations
- The earthquake struck just after midnight
- We are currently collecting data
Earthquake-Report.com GOOGLE+ / Earthquake-Report.com FACEBOOK
“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 : 6.8-6.9
UTC Time : Thursday, April 12, 2012 at 07:15:48 UTC
Local time at epicenter : Thursday, April 12, 2012 at 12:15:48 AM at epicenter
Depth (Hypocenter) : 10.3 km
134 km (83 miles) NE (48°) from Guerrero Negro, Baja California Sur, Mexico
162 km (101 miles) W (268°) from La Doce, Sonora, 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
NOAA tsunami report
I Have Felt this earthquake
|EMSC||Baja California, Mexico||Apr 12 07:15 AM||6.3||60||MAP I Felt It|
|GEOFON||Baja California, Mexico||Apr 12 07:15 AM||7.0||10||MAP I Felt It|
|GEOFON||Baja California, Mexico||Apr 12 07:06 AM||6.1||10||MAP I Felt It|
QuakeSOS+ and QuakeSOS free are iPhone applications developed by Armand Vervaeck, the founder of Earthquake Report. The Application simplifies immediate group communication to friends and family members (with your exact GPS location) and is feeding the users with Earthquake Report news. The 0.99 US$ QuakeSOS+ version will support the activities of SOS Earthquakes.
Earthquake-Report.com headlines on twitter
@OnlyQuakeNews : Get all the headlines of our earthquake-report.com articles + regular updates on ongoing events
@QuakeSOS : earthquake-report.com news + automatic earthquake notifications of USGS earthquakes of M 4.0 or higher with emphasis to earthquakes in the America’s and the Pacific Ocean sphere (4 and up) and a lot of the rest of the world (5 and up). This account was created for our QuakeSOS and QuakeSOS+ iPhone applications
@ShakingEarth : earthquake-report.com news + automatic earthquake notifications of EMSC earthquakes of M 4.0 or higher with emphasis to earthquakes in European and Asian / Middle East sphere (4 and up) and a lot of the rest of the world (5 and up). This account was originally created to stimulate our Facebook account
@QuakeMaps : earthquake-report.com news with mapping notifications of ALL earthquakes M 3.0 and higher from all over the world via EMSC and USGS. This account was created for our http://www.quake-maps.com website