(Major) Earthquakes list September 14, 2012 – Very strong earthquake just south of the Mentawai Islands, Indonesia

Last update: December 27, 2012 at 3:09 pm by By

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Image courtesy BMKG - Kedalaman = depth WIB = local time - NO tsunami - Gempa = quake

Very strong earthquake just south of the Mentawai Islands, Indonesia
The Mentawai Islands are located to the west of Sumatra and have been hit many times in the recent past by violent earthquakes and tsunamis.
But again … what a difference in hypocenter depth in between international agencies like EMSC and BMKG  and on the other hand local BMKG. BMKG is highly specialized, so we trust the local agency as (probably) most accurate.
The depth of BMKG is 83 km at a magnitude of M6.1 (see image at right).
NO tsunami was expected, but at the same time BMKG warned the people living in the Karimata strait to be aware of waves of 2 to 2,5 meter !
The combination of the Magnitude and focal depth led to an expected shaking of IV MMI only (light shaking).
So after all, worrisome at the start, but downplayed locally to a fairly normal earthquake.
The epicenter was located on the (dangerous) subduction slope.
We know from our experience while reporting about other Mentawai earthquakes, that the people are auto-evacuating to higher grounds after every serious earthquake, which certainly will have been the case today too.
The Mentawai islands are a surfers paradise which results often in video footage from foreigners who are not used to earthquakes (if they are not at sea of course).

A new damaging earthquake has occurred in Xinjiang in China. Over 1600 rooms and 1800 people have been affected.

Label info : M = magnitude, D = depth (km), Time = UTC – Click here for the Time Zone world map.
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SRC Location UTC Date/time M D INFORMATION
EMSC Costa Rica Sep 14 23:13 PM 4.4 35 MAP I Felt It
USGS Costa Rica Sep 14 23:13 PM 4.4 35 MAP I Felt It
GEOFON Off Coast Of Oregon Sep 14 20:24 PM 4.5 10 MAP I Felt It
USGS Off The Coast Of Oregon Sep 14 20:24 PM 4.7 1 MAP I Felt It
EMSC Northern California Sep 14 11:53 AM 4.5 24 MAP I Felt It
USGS Northern California Sep 14 11:53 AM 4.4 27 MAP I Felt It
  • Loleta, ca - Light shaking reported
  • eureka, ca - I have the (moderate) shaking too at Eureka
  • Eureka - Right around midnight I got woke up by my mobile home shaking. I disregarded it as wind til a co-worker asked me if I felt it.
  • Rio Dell ca - it just woke me up
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    EMSC Southern Mid-atlantic Ridge Sep 14 07:18 AM 5.1 10 MAP I Felt It
    GEOFON Southern Mid Atlantic Ridge Sep 14 07:18 AM 5.5 10 MAP I Felt It
    USGS Southern Mid-atlantic Ridge Sep 14 07:18 AM 5.1 10 MAP I Felt It
    EMSC Tristan Da Cunha Region Sep 14 06:56 AM 5.1 33 MAP I Felt It
    GEOFON Southern Mid Atlantic Ridge Sep 14 06:56 AM 4.9 10 MAP I Felt It
    USGS Southern Mid-atlantic Ridge Sep 14 06:56 AM 5.1 10 MAP I Felt It
    GEOFON Hindu Kush Region, Afghanistan Sep 14 06:45 AM 4.6 160 MAP I Felt It
    EMSC Hindu Kush Region, Afghanistan Sep 14 06:45 AM 4.6 167 MAP I Felt It
    USGS Hindu Kush Region, Afghanistan Sep 14 06:45 AM 4.5 165 MAP I Felt It
    USGS Kepulauan Mentawai Region, Indonesia Sep 14 04:51 AM 6.2 19 MAP I Felt It
    EMSC Kep. Mentawai Region, Indonesia Sep 14 04:51 AM 6.2 30 MAP I Felt It
    GEOFON Southern Sumatra, Indonesia Sep 14 04:51 AM 6.1 33 MAP I Felt It
    EMSC Northern Xinjiang, China Sep 14 03:21 AM 5.1 2 MAP I Felt It
    GEOFON Northern Xinjiang, China Sep 14 03:21 AM 5.1 10 MAP I Felt It
    USGS Northern Xinjiang, China Sep 14 03:21 AM 5.0 26 MAP I Felt It
    ER Unconfirmed Unlinked Experiences Sep 14 00:00 AM 4.6 0 MAP I Felt It
  • India - Felt dizzy and a mild shake in Pondicherry... but towards 3:30 Pm Indian time. Kept feeling as if there is an earthquake. When I checked the news I see that earlier today there were earthquakes earlier during the day .
    		•

    Data sources courtesy : USGS – EMSC – GFZ – GEONET

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

    Near The East Coast Of Honshu, Japan Sep 13 17:22 PM M 5.2 Depth 38.3 km

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    I have felt it – Ik heb het gevoeld – Το έκανα αισθάνεται – Yo lo he sentido – 我的确感到了 – 私はそれを感じていました- Ich habe es gefühlt – Bunu hissediyorum yaptı – لم أشعر أنه

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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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