Damaging earthquake in Papua (former Irian Jaya), Indonesia – update

Last update: April 23, 2012 at 10:34 am by By

Earthquake overview : A very shallow earthquake 10 km out of the Irian Jaya coast, Indonesia has scared people who are not panicking for a little shaking, as earthquakes are almost common as bad weather in this area of the world.
“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).
This article has been written by Armand Vervaeck, James Daniell and Carlos Robles
Check also our Indoensia-only earthquake list

Keep this page open or return regularly as we will be back with more details when they become available

Update April 23 – 10:17 UTC
A local Papua newspaper is giving a few more details on the inflicted damage.
- Landslides on the main road of Manokwari towards Ransiki have been cleared by workers
- The damage has occurred in the following villages : Ransiki, Tubou, Hamawi and Nyamtui
- The Pentecostal Church in Ransiki got a lot of damage.
- A bridge in Ransiki had many cracks and newly installed drains collapsed too
This reports mentions a lot of of cracked houses and some of them severely damaged.


Update April 22 – 17:49 UTC
The damage in the Ransiki districts (closest to the epicenter) is a lot bigger than initially expected. Almost all house walls have cracks and many houses were heavily damaged.  The Ransiki mosque was also damaged.
We have no word of serious injuries but people are so afraid for strong aftershocks that they decided to stay overnight in the open air.

Click on this image to be linked to the video page of this report


Update 11:23 UTC:  It has been reported that the quake caused a bridge connecting the Ransiki-Manokwari to have minor damage. A total of 10 houses damaged moderately, and dozens of others were slightly damaged.

- Update 11:03 UTC
* As usual the local media are always focusing more on the bigger cities in the area, in this case Manokwari. In Manokwari people are saying that the strong shaking only lasted 3 seconds. People rushed out of the buildings. There was no news of any damage or injuries at Manokwari.

- The biggest city in the area is Manokwari who has experienced a strong MMI VI shaking. Manokwari has a population of 53,000 people.

- The fault who generated the earthquake is called “Ransiki fault”.  Both sides of the fault are moving approx. 8.5 mm/year.

- Local BMKG is reporting a Magnitude of 6.8 at a depth of 10 km (bot stronger than reported by USGS)

- Modified Mercalli Shaking Intensities : 4,000 people : Severe VIII shaking, 8,000 people : Very strong VII shaking and 169,000 people VI strong shaking.

- GDACS has calculated that the following locations might get waves of max. 0.2 meter (not a real tsunami but only strong current and waves)  :  Rapaowi, Ransiki, Jali Ali, Sisember and Robookisbia

- 160,000 people are living within a radius of 100 km. The repartition of the population is as follows :
75 km     29000 people;  50 km     16000 people; 20 km     5200 people and 10 km     less than 1000 people
Earthquake-report.com calls an area of 25 km at risk (about 7000 people – number based on GDACS data) for serious damage and injuries.

Ransiki town / village - only approx. 10 km from the epicenter - image courtesy Toto Purwanto

- Oransbari and Ransiki are 2 villages located in a radius of 25 km around the epicenter. Especially this area will get the greatest shaking impact. Based on satellite images, Ransiki seems to have a STOL airport (short take off and landing)

- The earthquake is somewhat weakened because of an epicenter just out in the sea

- Due to the Magnitude and the close distance to the beach, NOAA has published the following Tsunami statement for the Pacific region :
NO DESTRUCTIVE WIDESPREAD TSUNAMI THREAT EXISTS BASED ON HISTORICAL EARTHQUAKE AND TSUNAMI DATA.
HOWEVER
EARTHQUAKES OF THIS SIZE SOMETIMES GENERATE LOCAL TSUNAMIS THAT CAN BE DESTRUCTIVE ALONG COASTS LOCATED WITHIN A HUNDRED KILOMETERS OF THE EARTHQUAKE EPICENTER. AUTHORITIES  IN THE REGION OF THE EPICENTER SHOULD BE AWARE OF THIS POSSIBILITY AND TAKE APPROPRIATE ACTION.


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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


Green radius = strong shaking; yellow radius = very strong shaking, severe shaking too small to fit on this map

Most important Earthquake Data:
Magnitude : Mw6.6
UTC Time : Saturday, April 21, 2012 at 01:16:52 UTC
Local time at epicenter : Saturday, April 21, 2012 at 10:16:52 AM at epicenter
Depth (Hypocenter) : 16 km (9.9 miles)
Geo-location(s) :
10 km SE from Ransiki, Papua, Indonesia
83 km (51 miles) SSE of Manokwari, Papua, Indonesia

Links to important maps
Google satellite map showing the epicenter and the surrounding area
Historic earthquakes map
Seismic hazard map
Shaking map
Focal mechanism report
Human impact map
GDACS earthquake report
NOAA Tsunami report

I Have Felt this earthquake

SRC Location UTC Date/time M D INFO
EMSC Kepulauan Babar, Indonesia Apr 21 15:27 4.6 98 MAP I Felt It
USGS Minahasa, Sulawesi, Indonesia Apr 21 13:23 4.7 51 MAP I Felt It
EMSC Minahasa, Sulawesi, Indonesia Apr 21 13:23 4.8 60 MAP I Felt It
GEOFON Irian Jaya Region, Indonesia Apr 21 02:16 4.9 10 MAP I Felt It
EMSC Near N Coast Of Papua, Indonesia Apr 21 02:16 4.7 87 MAP I Felt It
USGS Near The North Coast Of Papua, Indonesia Apr 21 02:16 4.5 15 MAP I Felt It
EMSC Near N Coast Of Papua, Indonesia Apr 21 02:01 4.3 35 MAP I Felt It
USGS Near The North Coast Of Papua, Indonesia Apr 21 02:01 4.3 35 MAP I Felt It
EMSC Near N Coast Of Papua, Indonesia Apr 21 01:25 6.0 10 MAP I Felt It
GEOFON Irian Jaya Region, Indonesia Apr 21 01:25 6.0 10 MAP I Felt It
EMSC Near N Coast Of Papua, Indonesia Apr 21 01:25 5.6 10 MAP I Felt It
USGS Near The North Coast Of Papua, Indonesia Apr 21 01:25 5.6 27 MAP I Felt It
USGS Near The North Coast Of Papua, Indonesia Apr 21 01:16 6.6 16 MAP I Felt It
USGS Near The North Coast Of Papua, Indonesia Apr 21 01:16 6.9 33 MAP I Felt It
EMSC Near N Coast Of Papua, Indonesia Apr 21 01:16 6.6 10 MAP I Felt It
GEOFON Irian Jaya Region, Indonesia Apr 21 01:16 6.6 27 MAP I Felt It

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SHARE YOUR EARTHQUAKE EXPERIENCE WITH US

Enter Email (not compulsory)
Country where you felt the earthquake
City/Village where you felt the earthquake
Street or suburb (area) 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.
Write your experience below + let us know if your property has been damaged (even slight damage) or if you have knowledge of any damage caused by this earthquake. (max. 500 characters)

Comments

  1. Wasn’t this again a strike slip earthquake (similar to the one earlier this month) and so chances of tsunami were relatively low?

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