M6.6 earthquake hits Sumatra

Last update: June 24, 2012 at 5:46 pm by By

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BMKG Shakemap of the earthquake (courtesy: BMKG)

UPDATE:- From the epicenter, reports are that there was major panic with people jumping out of houses, however at this point there is no damage being reported.

Many people fled from hospitals in Singkil, scared of a collapse. They are currently outside, awaiting aftershocks.

The last major quake in the epicentral region was around a year ago, claiming a life and damaging 100s of buildings.

An intermediate depth earthquake has hit Sumatra near Aceh.  Shaking could hit a VI intensity.

The earthquake has been reported as a weak shaking tapering off quite quickly which is good news from these localities.

This earthquake was felt by people in Penang in Malaysia quite strongly.

A tsunami warning was issued, but for such a deep hypocenter it is usually unlikely that such a large tsunami would result. Only due to underwater landslides.

Most important Earthquake Data:
Magnitude : Ml6.6 (BMKG)
UTC Time : 23rd June 2012
Local time at epicenter : 23rd June 2012 - 11:34:52 Indonesian WIB
Depth (Hypocenter) : 103km
Geo-location(s) : 24 km NW of KOTA-SUBULUSSALAM-NAD
40 km NW of KAB-ACEHSINGKIL
42 km SE of KAB-ACEHSELATAN
127 km SW of MEDAN-SUMUT
1417 km NW of JAKARTA-INDONESIA

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
Shaking map (USGS – Mw5.9)
Scientific parameters (USGS – Mw5.9)
Human impact map (USGS – Mw5.9)

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SRC Location UTC Date/time M D INFORMATION
EMSC Kepulauan Barat Daya, Indonesia Jun 23 07:42 AM 4.7 160 MAP I Felt It
USGS Kepulauan Barat Daya, Indonesia Jun 23 07:42 AM 4.7 143 MAP I Felt It
USGS Northern Sumatra, Indonesia Jun 23 04:34 AM 5.9 97 MAP I Felt It
EMSC Northern Sumatra, Indonesia Jun 23 04:34 AM 6.1 93 MAP I Felt It
  • Medan, North Sumatera - Very weak shaking reported
  • Medan - It was strong first, then tapered away after 2 mins
  • Kota Medan - di Medan Terasa, Aman
  • Medan - Light shaking indicated
  • Medan - please no more shaking, i get dizzy
  • Nias Island - I was working on my computer in my office Yayasan Holi'ana'a when I felt the first shaking. It was very weak. My friend in my room didn't feel. Then after 2 minutes there the strong shaking happened that made me and my friend automatically running away from the building. It was strong but just a while..maybe less then a minute.
  • South mentawaii - Not felt at all
  • Penang - OMG this is my 3rd experince.. I'm shaking !!!
    		•
    GEOFON Northern Sumatra, Indonesia Jun 23 04:34 AM 6.1 86 MAP I Felt It
  • Penang Island - very weak. Notice hanging lights swaying
  • Penang, Malaysia - hanging items shake
  • Penang, MALAYSIA - Weak shaking
  • Penang - Strongest shake among 3 earthquakes before
  • Penang - On 17th floor apartment. Swaying felt.
  • sea view tower penang - we felt the shaking for 2 min. while we were doing the prepareration for the kids to go out. it stopped.
  • Penang - I thought I was dizzy
  • Penang - Just a while only ...
  • Penang - All my kitchen utensils hanging on the wall were swaying like crazy.
  • Penang - All my kitchen utensils hanging on the wall were shaking like crazy
  • penang,Malaysia - I was working in the office while i felt the shaking, most of my colleagues felt it too!!!
  • Petaling Jaya - i thought i was dizzy, because none of my roommates seem to experience it.
  • Georgetown, Penang - Coffee in glass shaking and on the 3rd floor of hotel felt a swaying motion.
  • Butterworth, Penang - My 11th time experienced on earthquake... There's nothing to scared about it.. ...
  • Penang Sg.Pinang - i tought my preasure up againt and start worry but normal. finally found earthquake happened after story by friend.
  • Georgetown penang - Lol my mom was overreacting but yeah was quite shaky I was just walking around laughing at her lol
  • Penang - I felt it too..I dowan to die in tune hotel office..
  • malaysia - I felt the shake later suffered with severe headache.
  • Penang - I thought I was dizzy..
  • Penang - Last for about 30second
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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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