(Major) Earthquakes list August 27, 2012 – Massive earthquake far out of the El Salvador coast

Last update: August 27, 2012 at 9:17 pm by By

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Moderate earthquake in the Gulf of California
Preliminary readings are showing that an earthquake occurred in the middle of the Gulf of California, some 70 km out of the Mexican coast

Massive earthquake along the coast of El Salvador ??
Preliminary Magnitude and depth : M7.4 @ 52.9 km
Approx. 125 km out of the coast
NOAA reports : 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.
Max. wave height along the Central America coast : 0.1 meter or NO danger
NO people are living within a radius of 100 km
Important Update : Confusion in seismic land : The 3 main international agencies are reporting very conflicting numbers. Geofon reports a Magnitude of M6.6 and EMSC only a M5.2
Our attention was attracted to the fact that we had very few readers from Central America which is opposite on what we see otherwise. Hard to believe that a massive quake at 50 km at 125 km out of the coasr would not be felt by people on land.
The central american agencies are simply not reporting an earthquake at the time of occurrence. This data looks more and more being a hoax
Update : All the agencies are now showing 7+ magnitudes for the El Salvador earthquake, EMSC and Geofon even at shallower depths
Update 05:40 UTC : We are still confused about this massive earthquake as the local agencies still do not list it including El Salvador’s SNET and as we had no abnormal number of Central American readers in the website
(Almost) Final update 06:47 : The mystery has finally been solved. SNET (El Salvador) has also listed the earthquake as an M6.7 earthquake at a depth of 50 km but more than 200 km out of the coast. Additionally, the hypocenter of the earthquake was located in the oceanic plate and not in the North American plate. This event was in other words an intra-plate event and not a subduction earthquake like most of the earthquakes are in the area.
Update 07:17 : A couple of 5+ aftershocks occurred in the greater epicenter area. USGS has located the epicenter of all events in the subduction zone below the continental plate while snet was putting it more into the ocean.
- To make the confusion complate, also USGS has now updated the hypocenter from a +50 km to a depth of 20.3 km.
- Ineter Nicaragua is reporting the mainshock as a Mc5.9!
Update 09:19 UTC : A new strong aftershock struck closer to the El Salvador coast.
Update 12:14 UTC : Tsunami calculations greatly depend upon the underlying earthquake parameters. In a first tsunami report GDACS based their calculations on a depth of 52.3 km (data according USGS preliminary report). A max. waveheight of 0.1 m was the result. After that USGS changed the depth of the hypocenter to 20.3 km a totally different calculation resulted in a max. wave pattern of 0.5 meter, a huge difference. As it was evening in the epicenter area, we guess that almost nobody would have seen the waves. This event is a reminder that seismology is not an exact science and has still a quiet important error margin.

Image courtesy GDACS

Image courtesy GDACS

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SRC Location UTC Date/time M D INFORMATION
USGS Gulf Of California Aug 27 23:16 PM 5.0 10 MAP I Felt It
EMSC Gulf Of California Aug 27 23:16 PM 5.4 10 MAP I Felt It
GEOFON Gulf Of California Aug 27 23:16 PM 5.4 10 MAP I Felt It
EMSC Off East Coast Of Honshu, Japan Aug 27 23:05 PM 4.6 31 MAP I Felt It
USGS Off The East Coast Of Honshu, Japan Aug 27 23:05 PM 4.6 31 MAP I Felt It
EMSC Offshore El Salvador Aug 27 22:07 PM 4.8 30 MAP I Felt It
USGS Offshore El Salvador Aug 27 22:07 PM 4.8 35 MAP I Felt It
USGS Off The Coast Of Central America Aug 27 21:13 PM 4.8 35 MAP I Felt It
EMSC Off Coast Of Central America Aug 27 21:13 PM 4.7 46 MAP I Felt It
GEOFON Off Coast Of Central America Aug 27 21:13 PM 4.7 46 MAP I Felt It
USGS Kepulauan Talaud, Indonesia Aug 27 17:54 PM 5.3 19 MAP I Felt It
EMSC Kepulauan Talaud, Indonesia Aug 27 17:54 PM 5.1 40 MAP I Felt It
GEOFON Talaud Islands, Indonesia Aug 27 17:54 PM 5.2 46 MAP I Felt It
GEOFON Kermadec Islands Region Aug 27 16:00 PM 5.0 10 MAP I Felt It
USGS Kermadec Islands Region Aug 27 16:00 PM 5.0 39 MAP I Felt It
EMSC Kermadec Islands Region Aug 27 16:00 PM 5.0 40 MAP I Felt It
USGS Off The Coast Of Central America Aug 27 14:36 PM 4.6 35 MAP I Felt It
EMSC Off Coast Of Central America Aug 27 14:36 PM 4.7 20 MAP I Felt It
USGS Offshore El Salvador Aug 27 12:55 PM 4.6 20 MAP I Felt It
EMSC Andaman Islands, India Region Aug 27 12:05 PM 5.0 48 MAP I Felt It
USGS Andaman Islands, India Region Aug 27 12:05 PM 5.0 45 MAP I Felt It
GEOFON Andaman Islands, India Region Aug 27 12:05 PM 5.0 47 MAP I Felt It
USGS Off The Coast Of El Salvador Aug 27 10:59 AM 4.7 20 MAP I Felt It
EMSC Off The Coast Of El Salvador Aug 27 10:59 AM 4.7 20 MAP I Felt It
GEOFON Off Coast Of Central America Aug 27 09:05 AM 4.9 35 MAP I Felt It
EMSC Near Coast Of Nicaragua Aug 27 09:05 AM 5.1 20 MAP I Felt It
USGS Near The Coast Of Nicaragua Aug 27 09:05 AM 5.1 20 MAP I Felt It
EMSC Northern Sumatra, Indonesia Aug 27 09:01 AM 5.2 157 MAP I Felt It
GEOFON Northern Sumatra, Indonesia Aug 27 09:01 AM 5.1 144 MAP I Felt It
USGS Northern Sumatra, Indonesia Aug 27 09:01 AM 5.3 151 MAP I Felt It
USGS Offshore El Salvador Aug 27 08:16 AM 4.6 35 MAP I Felt It
EMSC Off The Coast Of El Salvador Aug 27 08:14 AM 4.7 20 MAP I Felt It
EMSC Offshore El Salvador Aug 27 08:05 AM 4.7 20 MAP I Felt It
GEOFON Off Coast Of Central America Aug 27 08:05 AM 4.6 10 MAP I Felt It
USGS Off The Coast Of El Salvador Aug 27 08:05 AM 4.7 35 MAP I Felt It
USGS Off The Coast Of El Salvador Aug 27 07:47 AM 4.7 35 MAP I Felt It
EMSC Off The Coast Of El Salvador Aug 27 07:47 AM 4.6 20 MAP I Felt It
GEOFON Kuril Islands Aug 27 06:37 AM 4.6 60 MAP I Felt It
EMSC Kuril Islands Aug 27 06:37 AM 4.6 66 MAP I Felt It
EMSC Offshore El Salvador Aug 27 05:38 AM 5.3 20 MAP I Felt It
USGS Offshore El Salvador Aug 27 05:38 AM 5.4 20 MAP I Felt It
GEOFON Off Coast Of Central America Aug 27 05:38 AM 5.1 45 MAP I Felt It
GEOFON Gulf Of California Aug 27 05:23 AM 5.5 10 MAP I Felt It
USGS Gulf Of California Aug 27 05:23 AM 5.2 10 MAP I Felt It
EMSC Gulf Of California Aug 27 05:23 AM 5.2 10 MAP I Felt It
USGS Off The Coast Of El Salvador Aug 27 05:01 AM 4.6 19 MAP I Felt It
EMSC Off The Coast Of El Salvador Aug 27 05:01 AM 4.6 20 MAP I Felt It
GEOFON Off Coast Of Central America Aug 27 04:53 AM 5.0 25 MAP I Felt It
USGS Offshore El Salvador Aug 27 04:53 AM 4.8 20 MAP I Felt It
EMSC Offshore El Salvador Aug 27 04:53 AM 4.8 20 MAP I Felt It
EMSC Southern California Aug 27 04:41 AM 4.9 10 MAP I Felt It
  • Chula Vista - Lying in bed & felt shaking that went on for at least 6 seconds
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    USGS Southern California Aug 27 04:41 AM 4.9 9 MAP I Felt It
  • Dowtown San Diego - felt the swey on the 9th floor
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    GEOFON Calif.-baja Calif. Border Region Aug 27 04:41 AM 5.1 10 MAP I Felt It
    EMSC Offshore El Salvador Aug 27 04:37 AM 5.2 40 MAP I Felt It
    GEOFON Off Coast Of Central America Aug 27 04:37 AM 7.3 15 MAP I Felt It
    EMSC Offshore El Salvador Aug 27 04:37 AM 7.4 25 MAP I Felt It
    USGS Offshore El Salvador Aug 27 04:37 AM 7.3 20 MAP I Felt It
    USGS Off The Coast Of El Salvador Aug 27 04:37 AM 7.4 50 MAP I Felt It
    EMSC Luzon, Philippines Aug 27 04:28 AM 4.7 51 MAP I Felt It
  • Vintar Ilocos Norte Philippines - Moderate shaking reported
    		•
    GEOFON Philippine Islands Region Aug 27 04:28 AM 4.9 10 MAP I Felt It
    EMSC Molucca Sea Aug 27 03:47 AM 5.1 100 MAP I Felt It
    GEOFON Northern Molucca Sea Aug 27 03:47 AM 5.2 76 MAP I Felt It
    USGS Molucca Sea Aug 27 03:47 AM 5.0 82 MAP I Felt It
    USGS Antofagasta, Chile Aug 27 00:39 AM 5.1 57 MAP I Felt It
    EMSC Antofagasta, Chile Aug 27 00:39 AM 5.1 50 MAP I Felt It
    GEOFON Northern Chile Aug 27 00:39 AM 5.1 64 MAP I Felt It

    Data sources courtesy : USGS – EMSC – GFZ – GEONET

    Earthquakes occurred yesterday (UTC time), but today local time

    Halmahera, Indonesia Aug 26 23:06 PM M 5.0 44.6

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    City/Village where you felt the earthquake
    MMI II (Very weak shaking) ?
    People :
    Felt by persons at rest, on upper floors or favorably placed.
    MMI III (Weak shaking) ?
    People :
    Felt indoors; hanging objects may swing, vibration similar to passing of light trucks, duration may be estimated, may not be recognized as an earthquake.
    MMI IV (Light shaking) ?
    People :
    Generally noticed indoors but not outside. Light sleepers may be awakened. Vibration may be likened to the passing of heavy traffic, or to the jolt of a heavy object falling or striking the building.
    Fittings :
    Doors and windows rattle. Glassware and crockery rattle. Liquids in open vessels may be slightly disturbed. Standing motorcars may rock.
    Structures :
    Walls and frames of buildings, and partitions and suspended ceilings in commercial buildings, may be heard to creak.
    MMI V (Moderate shaking) ?
    People :
    Generally felt outside, and by almost everyone indoors. Most sleepers awakened. A few people alarmed.
    Fittings :
    Small unstable objects are displaced or upset. Some glassware and crockery may be broken. Hanging pictures knock against the wall. Open doors may swing. Cupboard doors secured by magnetic catches may open. Pendulum clocks stop, start, or change rate.
    Structures :
    Some large display windows cracked. A few earthenware toilet fixtures cracked.
    MMI VI (Strong shaking) ?
    People Felt by all. People and animals alarmed. Many run outside. Difficulty experienced in walking steadily.
    Fittings :
    Objects fall from shelves. Pictures fall from walls. Some furniture moved on smooth floors, some unsecured free-standing fireplaces moved. Glassware and crockery broken. Very unstable furniture overturned. Small church and school bells ring. Appliances move on bench or table tops. Filing cabinets or "easy glide" drawers may open (or shut).
    Structures :
    Slight damage to buildings with low standard. Some stucco or cement plaster falls. Large display windows broken. Damage to a few weak domestic chimneys, some may fall.
    Environment :
    Trees and bushes shake, or are heard to rustle. Loose material may be dislodged from sloping ground, e.g. existing slides, talus slopes, shingle slides.
    MMI VII (Very strong shaking) ?
    People
    General alarm. Difficulty experienced in standing. Noticed by motorcar drivers who may stop.
    Fittings :
    Large bells ring. Furniture moves on smooth floors, may move on carpeted floors. Substantial damage to fragile contents of buildings.
    Structures :
    Unreinforced stone and brick walls cracked. Low standard buildings cracked with some minor masonry falls. A few instances of damage to buildings of ordinary workmanship. Unbraced parapets, unbraced brick gables, and architectural ornaments fall. Roofing tiles, especially ridge tiles may be dislodged. Many unreinforced domestic chimneys damaged, often falling from roof-line. Water tanks Type I burst. A few instances of damage to brick veneers and plaster or cement-based linings. Unrestrained water cylinders (hot-water cylinders) may move and leak. Some common windows cracked. Suspended ceilings damaged.
    Environment :
    Water made turbid by stirred up mud. Small slides such as falls of sand and gravel banks, and small rock-falls from steep slopes and cuttings. Instances of settlement of unconsolidated or wet, or weak soils. Some fine cracks appear in sloping ground. A few instances of liquefaction (i.e. small water and sand ejections).
    MMI VIII (Severe shaking) ?
    People Alarm may approach panic. Steering of motorcars greatly affected. Structures : Low standard buildings heavily damaged, some collapse. ordinary workmanship buildings damaged, some with partial collapse. Reinforced masonry or concrete buildings damaged in some cases. A few instances of damage to buildings and bridges designed and built to resist earthquakes. Monuments and pre-1976 elevated tanks and factory stacks twisted or brought down. Some pre-1965 infill masonry panels damaged. A few post-1980 brick veneers damaged. Decayed timber piles of houses damaged. Houses not secured to foundations may move. Most unreinforced domestic chimneys damaged, some below roof-line, many brought down. Environment : Cracks appear on steep slopes and in wet ground. Small to moderate slides in roadside cuttings and unsupported excavations. Small water and sand ejections and localized lateral spreading adjacent to streams, canals, lakes, etc.
    MMI IX (Violent shaking) ?
    Structures Many low standard buildings destroyed. Ordinary workmanship buildings heavily damaged, some collapse. Reinforced masonry or concrete buildings damaged, some with partial collapse. Buildings and bridges designed and built to resist earthquakes damaged in some cases, some with flexible frames seriously damaged. Damage or permanent distortion to some buildings and bridges, designed and built to normal use standards. Houses not secured to foundations shifted off. Brick veneers fall and expose frames. Environment : Cracking of ground conspicuous. Landsliding general on steep slopes. Liquefaction effects intensified and more widespread, with large lateral spreading and flow sliding adjacent to streams, canals, lakes, etc.
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