Another Strong Quake Strikes Haiti as Expected

Earthquake Measuring Up to 6.4 Mw Strikes Offshore 60 km  WSW of PORT-AU-PRINCE, Haiti

The earthquake struck 9.9 km (6.2 miles), but was poorly constrained, USGS/EHP reported.

The event occurred about 880 km of  a strong quake that struck near the Grand Cayman earlier today.

On January 13 after the first powerful earthquake struck, FEWW said:

FEWW Forecast: Another Major Earthquake Could Strike the Region Soon with a Probability of 60% [P ≥ 0.55]

FEWW Moderators also forecast earlier to day as follows:

The Gonave Microplate, near the boundaries of which this earthquake occurred, could produce more seismicity in 2010, with possibly another powerful quake measuring 7.4 to 7.6Mw striking its southern boundary.  Kingston, Jamaica could experience a powerful quake with a probability of 65 percent.

10-degree Map Centered at 20°N,75°W

Earthquake Location map. Source: USGS/EHP. Enhanced by FEWW.

Estimated Population Exposed to Earthquake Shaking. Click Image for USGS PDF file.

Earthquake Details

• Magnitude: 6.1 [EQ magnitude estimated by FEWW: 6.4 Mw]
• Date-Time:
  • Wednesday, January 20, 2010 at 11:03:44 UTC
  • Wednesday, January 20, 2010 at 06:03:44 AM at epicenter
• Location: 18.428°N, 72.875°W
• Depth: 9.9 km (6.2 miles) (poorly constrained)
• Region: HAITI REGION
• Distances:
  • 60 km (35 miles) WSW of PORT-AU-PRINCE, Haiti
  • 95 km (60 miles) ENE of Les Cayes, Haiti
  • 160 km (100 miles) SSW of Cap-Haitien, Haiti
  • 1110 km (690 miles) SE of Miami, Florida
• Location Uncertainty: horizontal +/- 6.5 km (4.0 miles); depth +/- 25.7 km (16.0 miles) –Possible error
• Source: USGS NEIC (WDCS-D)
• Event ID: us2010rsbb

USGS Shakemap. Click image to enlarge.

Seismic Hazard Map. Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green  (USGS). Click image to enlarge.

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Location Map (USGS). Click image to enlarge.

Map of Haiti. USGS/EHP

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. Location Map (USGS). Click image to enlarge.

Tsunami Advisory:

The quake should have produced a small local tsunami. However, the NWS Pacific Tsunami Warning Center at Ewa Beach, Hawaii, at 11:11 UTC Wed Jan 20,  2010 said:

A destructive tsunami was not generated based on earthquake and historical tsunami data. This earthquake is located too far inland to generate a tsunami in the Caribbean.

The coordinates provided by NWSPTWC were: 18.6 NORTH 72.9 WEST.  And the Quake Location Details according to USGS were: 18.428°N, 72.875°W
Both sets of coordinates place the quake epicenter offshore Haiti, according to Google Earth.

Google Map of the Quake Location places the epicenter of the earthquake offshore Haiti (Hispaniola Island). Image may be subject to copyright. Click image to enlarge.

Related Links:

• Strong Quake Strikes Cayman Islands Region
• Haiti Quake Causes Widespread Death, Destruction
• Haiti Earthquake Disaster Links Page!

• FEWW Volcano Links
• Volcanoes
• Earthquakes

• More Photos from Port-au-Prince

Haiti Quake Causes Widespread Death, Destruction

M7.3 EQ Causes Widespread Damage in Haiti

Powerful quake measuring up to 7.3 Mw strikes SW of PORT-AU-PRINCE, many feared dead

FEWW Forecast: Another Major Earthquake Could Strike the Region Soon with a Probability of 60% [P ≥ 0.55]

The quake struck about 15 km (10 miles) SW of PORT-AU-PRINCE, Haiti at an approximate  depth of 10 km on Tuesday, January 12, 2010 at 21:53 UTC, USGS/EHP reported.

The mainshock, as of posting, was followed by at least 3 significant aftershocks the largest of which measured up to 6.2 Mw.

Haiti is the poorest country in the western hemisphere with abysmal civic and urban infrastructure. The aftermath of this quake could well prove to be catastrophic, with thousands of people killed or injured.

PORT-AU-PRINCE has an estimated population of about 1.2 million.

Estimated Population Exposed to Earthquake Shaking:

• Up to 240,000 people live in the “extreme” and  “violent” zones of the quake epicenter exposed to the earthquake shaking and most severe destruction.
• A total of 1.2 million people live within the “severe” zone of the earthquake damage.

Click Image for USGS PDF file.

Earthquake Location map. Source: USGS/EHP. Enhanced by FEWW. (Click Images to enlarge).

Earthquake Details

• Magnitude:  [FEWW Estimate: 7.3Mw – USGS/EHP routinely downgrades earthquakes by about 0.3 Mw]
• Date-Time:
  • Tuesday, January 12, 2010 at 21:53:09 UTC
  • Tuesday, January 12, 2010 at 04:53:09 PM at epicenter
• Location: 18.451°N, 72.445°W
• Depth: 10 km (6.2 miles)
• Region HAITI REGION
• Distances
  • 15 km (10 miles) SW of PORT-AU-PRINCE, Haiti
  • 140 km (90 miles) E of Les Cayes, Haiti
  • 145 km (90 miles) WNW of Barahona, Dominican Republic
  • 1140 km (710 miles) SE of Miami, Florida
• Location Uncertainty: horizontal +/- 8.3 km (5.2 miles)
• Source:  USGS NEIC (WDCS-D)
• USGS/EHP Event ID: us2010rja6

Seismic Hazard Map. Click image to enlarge. USGS/EHP

Political Map of Haiti. USGS/EHP
e

Earthquake Location. Haiti Region. USGS/EHP

Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green. USGS/EHP

Historic Seismicity

Shakemap. Click image to enlarge.

Credit: All images on this page are sourced from USGS/EHP

Tsunami Evaluation

NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI 23:45 UTC TUE JAN 12 2010

A tsunami measuring 12 cm crest-to-trough was recorded at Santo Domingo in the Dominican Republic and a tsunami less than 1 cm  crest-to-trough was recorded on a deep ocean gauge in the east-central Caribbean.  Based on these data there could have been destructive tsunami waves near the earthquake epicenter but there is not a threat to coastal areas further away.Therefore the tsunami watch issued by this center is now canceled.

For any affected areas – when no major waves have occurred for at least two hours after the estimated arrival time or damaging waves  have not occurred for at least two hours then local authorities  can assume the threat is passed. Danger to boats and coastal structures can continue for several hours due to rapid currents. As local conditions can cause a wide variation in tsunami wave action the all clear determination must be made by local authorities.

This will be the final product issued by the Pacific Tsunami Warning Center for this event unless additional information becomes available.

Historic Earthquakes in the Region

• Samana, Dominican Republic,  August 04,  1946 at 17:51 UTC, Magnitude 8.0
• Aftershock,  August 08, 1946 at  13:28 UTC, Magnitude 7.6

The mainshock struck about 370 km ESE of a M8.0 quake which struck about 65 km off the northeast coast of the Dominican Republic in 1946. The large earthquake was followed by a major M7.6 aftershock.

The mainshock occurred about 65 km off the northeast coast of the Dominican Republic, causing severe damage in northern Dominican Republic from Samana to Santiago and Puerto Plata. The quake left about 100 people dead and more than 20,000 people homeless.

“Almost all the people killed were drowned by a tsunami at Matanzas, near Nagua (Julia Molina). Although the waves were only about 2.5 m (8 ft) high at this location, they moved inland several km, causing such severe damage that the town was abandoned. Maximum wave heights were estimated at 4-5 m (13-16 ft) at Nagua. A small tsunami was recorded by tide gauges at San Juan, Puerto Rico; Bermuda; Daytona Beach, Florida and Atlantic City, New Jersey.” USGS said.

The 7.6 M aftershock, which occurred 4 days after the mainshock, generated a small tsunami and caused additional damage.

Related Links:

• Volcanoes
• Earthquakes
• FEWW Volcano Links

For More Information Visit Haiti Earthquake Disaster Links Page!