March 02, 2014 - NICARAGUA - A strong 6.4 magnitude earthquake struck Nicaragua just off its north-western Pacific coastline, the US Geological Survey, which monitors earthquakes worldwide, reported Sunday.
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| USGS earthquake location map. |
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| USGS earthquake shakemap intensity map. |
The epicenter of the quake, which stuck at 0937 GMT, was in the ocean 23 kilometers (14 miles) west-southwest of the town of Jiquilillo, and 160 kilometers (99 miles) west-northwest of the capital Managua, the USGS reported.
The quake epicenter is at a depth of 70.9 kilometers (44 miles) and located just south of the Gulf of Fonseca, shared by Nicaragua, Honduras and El Salvador.
In El Salvador, government officials said that the earthquake was felt across the small Central American country.
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| USGS earthquake uncertainty ratio map. |
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| Seismic waves generated from the earthquake, produced on a seismograph. Earthquake Report |
"There are no reports of personal or material damage," the Salvadoran office of Civil Protection said.
No report yet from officials in Nicaragua or Honduras.
Due to the depth of the hypocenter, we expect that this earthquake might cause maximum some slight damage (based on the epicenter off the coast). This estimate is only valid if the current earthquake data will be confirmed.
The Nicaraguan press is reporting continuous aftershocks in the greater epicenter area
It is estimated that tens of millions of people have felt this earthquake at various intensities. A lot of people will have been interrupted from their sleep. The reason that so many people have felt it is the depth of the hypocenter. At earthquake-report.com we know from our experience that earthquakes in between 50 and 80 km depth are being felt as strong up to several hundred kms from the epicenter. This is also the reason that we are receiving “I Have Felt It” reports from all the neighboring countries (luckily without serious damage so far).
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| USGS earthquake population exposure map. |
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| USGS earthquake estimates of fatalities and losses map. |
The James Daniell CATDAT theoretical damage engine comes out below 1 million $ damage for this earthquake. This model is based on parameters like Magnitude, depth of the hypocenter and damage during historical earthquakes in the same region.
Maximum shaking intensity as reported by USGS (agency with the highest Magnitude) MMI VI = strong shaking. We, at Earthquake Report, are estimating Strong shaking with maximum slight damage and a minimal number of injuries. As this is a typical subduction earthquake, the main movement may have been up and down, aan earthquake movement which is less damaging than a mainly horizontal movement.
SOURCES:
Economic Times |
Earthquake Report.
Tectonic Summary Seismotectonics of the Caribbean Region and Vicinity
Extensive diversity and complexity of tectonic regimes characterizes
the perimeter of the Caribbean plate, involving no fewer than four
major plates (North America, South America, Nazca, and Cocos). Inclined
zones of deep earthquakes (Wadati-Benioff zones), ocean trenches, and
arcs of volcanoes clearly indicate subduction of oceanic lithosphere
along the Central American and Atlantic Ocean margins of the Caribbean
plate, while crustal seismicity in Guatemala, northern Venezuela, and
the Cayman Ridge and Cayman Trench indicate transform fault and
pull-apart basin tectonics.
Along the
northern margin of the Caribbean plate, the North America plate moves
westwards with respect to the Caribbean plate at a velocity of
approximately 20 mm/yr. Motion is accommodated along several major
transform faults that extend eastward from Isla de Roatan to Haiti,
including the Swan Island Fault and the Oriente Fault. These faults
represent the southern and northern boundaries of the Cayman Trench.
Further east, from the Dominican Republic to the Island of Barbuda,
relative motion between the North America plate and the Caribbean plate
becomes increasingly complex and is partially accommodated by nearly
arc-parallel subduction of the North America plate beneath the Caribbean
plate. This results in the formation of the deep Puerto Rico Trench and
a zone of intermediate focus earthquakes (70-300 km depth) within the
subducted slab. Although the Puerto Rico subduction zone is thought to
be capable of generating a megathrust earthquake, there have been no
such events in the past century. The last probable interplate (thrust
fault) event here occurred on May 2, 1787 and was widely felt throughout
the island with documented destruction across the entire northern
coast, including Arecibo and San Juan. Since 1900, the two largest
earthquakes to occur in this region were the August 4, 1946 M8.0 Samana
earthquake in northeastern Hispaniola and the July 29, 1943 M7.6 Mona
Passage earthquake, both of which were shallow thrust fault earthquakes.
A significant portion of the motion between the North America plate and
the Caribbean plate in this region is accommodated by a series of
left-lateral strike-slip faults that bisect the island of Hispaniola,
notably the Septentrional Fault in the north and the Enriquillo-Plantain
Garden Fault in the south. Activity adjacent to the Enriquillo-Plantain
Garden Fault system is best documented by the devastating January 12,
2010 M7.0 Haiti strike-slip earthquake, its associated aftershocks and a
comparable earthquake in 1770.
Moving east and south,
the plate boundary curves around Puerto Rico and the northern Lesser
Antilles where the plate motion vector of the Caribbean plate relative
to the North and South America plates is less oblique, resulting in
active island-arc tectonics. Here, the North and South America plates
subduct towards the west beneath the Caribbean plate along the Lesser
Antilles Trench at rates of approximately 20 mm/yr. As a result of this
subduction, there exists both intermediate focus earthquakes within the
subducted plates and a chain of active volcanoes along the island arc.
Although the Lesser Antilles is considered one of the most seismically
active regions in the Caribbean, few of these events have been greater
than M7.0 over the past century. The island of Guadeloupe was the site
of one of the largest megathrust earthquakes to occur in this region on
February 8, 1843, with a suggested magnitude greater than 8.0. The
largest recent intermediate-depth earthquake to occur along the Lesser
Antilles arc was the November 29, 2007 M7.4 Martinique earthquake
northwest of Fort-De-France.
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| USGS plate tectonics map for the region |
The southern Caribbean plate
boundary with the South America plate strikes east-west across Trinidad
and western Venezuela at a relative rate of approximately 20 mm/yr. This
boundary is characterized by major transform faults, including the
Central Range Fault and the BoconĂł-San Sebastian-El Pilar Faults, and
shallow seismicity. Since 1900, the largest earthquakes to occur in this
region were the October 29, 1900 M7.7 Caracas earthquake, and the July
29, 1967 M6.5 earthquake near this same region. Further to the west, a
broad zone of compressive deformation trends southwestward across
western Venezuela and central Columbia. The plate boundary is not well
defined across northwestern South America, but deformation transitions
from being dominated by Caribbean/South America convergence in the east
to Nazca/South America convergence in the west. The transition zone
between subduction on the eastern and western margins of the Caribbean
plate is characterized by diffuse seismicity involving low- to
intermediate-magnitude (Magnitude less than 6.0) earthquakes of shallow
to intermediate depth.
The plate boundary offshore of
Colombia is also characterized by convergence, where the Nazca plate
subducts beneath South America towards the east at a rate of
approximately 65 mm/yr. The January 31, 1906 M8.5 earthquake occurred on
the shallowly dipping megathrust interface of this plate boundary
segment. Along the western coast of Central America, the Cocos plate
subducts towards the east beneath the Caribbean plate at the Middle
America Trench. Convergence rates vary between 72-81 mm/yr, decreasing
towards the north. This subduction results in relatively high rates of
seismicity and a chain of numerous active volcanoes; intermediate-focus
earthquakes occur within the subducted Cocos plate to depths of nearly
300 km. Since 1900, there have been many moderately sized
intermediate-depth earthquakes in this region, including the September
7, 1915 M7.4 El Salvador and the October 5, 1950 M7.8 Costa Rica events.
The boundary between the Cocos and Nazca plates is
characterized by a series of north-south trending transform faults and
east-west trending spreading centers. The largest and most seismically
active of these transform boundaries is the Panama Fracture Zone. The
Panama Fracture Zone terminates in the south at the Galapagos rift zone
and in the north at the Middle America trench, where it forms part of
the Cocos-Nazca-Caribbean triple junction. Earthquakes along the Panama
Fracture Zone are generally shallow, low- to intermediate in magnitude
(Magnitude less than 7.2) and are characteristically right-lateral
strike-slip faulting earthquakes. Since 1900, the largest earthquake to
occur along the Panama Fracture Zone was the July 26, 1962 M7.2
earthquake. -
USGS.