Earthquakes list September 17, 2010

M 5.0      2010/09/17 23:12    Depth 41.0 km     KURIL ISLANDS
Near the island of Ostrov Urup.  Just above the trench (see link). Not dangerous.

M 4.5      2010/09/17 23:01    Depth 180.2 km     PAGAN REGION, NORTHERN MARIANA ISLANDS

Very moderate earthquake between the Mariana Islands Pagan and Agrihan. Very deep.

M 5.2      2010/09/17 19:34    Depth 66.3 km     KEPULAUAN TALAUD, INDONESIA
Epicenter only a few kilometers from Pulau Salibabu. The depth will however weaken the power of the earthquake

M 6.3      2010/09/17 19:21    Depth 199.7 km      HINDU KUSH REGION, AFGHANISTAN
Please also read the detailed page of this earthquake

M 4.7      2010/09/17 17:58    Depth 31.2 km      IZU ISLANDS, JAPAN REGION

In the subduction zone far away from populated islands

M 4.4   2010-09-17   12:20    Depth 10 km SOUTHERN ITALY
Epicenter near Foggia. Inhabitants of the area will have felt it strongly, but because of the magnitude not dangerous.

M 4.9      2010/09/17 11:10    Depth 9.2 km     SAMOA ISLANDS REGION
Shallow seaquake at a safe distance from the neighboring islands. Epicenter on the slopes of the subduction trench

M 4.6      2010/09/17 10:17    Depth 12.0 km     EASTERN TURKEY
Earthquakes in Turkey are always very scary as they are mostly shallow and dangerous slip-strike earthquakes. This magnitude is luckily to weak to cause any problems.

M 4.4      2010/09/17 08:45    Depth 61.1 km     OFFSHORE EL SALVADOR
Too deep to cause any problem at this magnitude. In the subduction zone of the cocos plate. Beautiful view of the trench

M 4.9      2010/09/17 06:52    Depth 25.3 km     BIO-BIO, CHILE
Moderate aftershock of the M 8.8 earthquake on February 27, 2010. Epicenter a couple of km’s from the shores under the continent.

M 4.7      2010/09/17 06:47    Depth 11.0 km     IZU ISLANDS, JAPAN REGION
Epicenter in the Izu-Ogasawara trench, the area lies full with shipwrecks of American Naval ships. Far away from the nearest islands.

M 4.9      2010/09/17 05:52    Depth 27.6 km     OFFSHORE VALPARAISO, CHILE
Moderate ocean-aftershock of the M 8.8 earthquake on February 27, 2010

M 5.3      2010/09/17 03:25    Depth 168.1 km     POTOSI, BOLIVIA

Very deep in the mantle of the earth. Most earthquakes in this area occur in the same harmless depth.

seismograph - recordingUseful information to read this daily earthquake list
This earthquake list covers minor and major earthquakes in the world.
If a more detailed page is present, the earthquake line will be linked to the detailed page.
For your comfort, we will provide in most cases Google Satellite Map links to give you an idea where the earthquake struck, which terrain it happened and if villages or cities are located in the immediate vicinity. The reference for the time zone is UTC (Coordinated Universal Time, also called GMT)
The page is regularly updated to add new earthquakes.
green color = NOT dangerous for damage or injuries
orange color = MODERATE risk for damage or injuries
red color = CONSIDERABLE risk for damage or injuries

QuakeSOS has been developed to help actively people who are caught in an earthquake + delivers "Earthquake Report" information on your iPhoneQuakeSOS is a FREE iPhone application developed by Armand Vervaeck, the creator and main contributor to Earthquake Report. The Application simplifies immediate group communication to friends and family members (with your exact GPS location) and is constantly feeding the users with “Earthquake Report” news. Together with your own family and friends, QuakeSOS will be your closest earthquake friend.

Understanding the creation and the earthquakes of the Galapagos Islands

Galapagos tectonics
Darwin had part of the answer on the Galapagos islands.
The answer to the origin of the Galápagos  was only available after 1958, when continental drift, or plate tectonics, was discovered.  We now understand that the surface of the earth is divided into massive tectonic plates which slowly drift across the globe.  The formation of the Galápagos is intimately tied to the history of the Nazca plate, on which they lie.

The Galápagos are located on the very northern edge of the Nazca plate, which is bounded by the Cocos (north) and the Pacific (west) plates (see map). The Nazca plate itself is currently drifting southeast, away from the Cocos plate and from the Pacific plate.  This movement of the Nazca plate relative to the Cocos plate is responsible for producing the cluster of volcanic islands we call Galápagos.

Divergent and transform boundaries in between the Cocos and Nazca plates - Graphic ; courtesy NOAA OceanExplorer

There is a large body of geophysical evidence for the existence of enormous plumes of hot mantle material that originate near the earth’s core and rise all the way to the crust. These plumes seem to be stable over many millions of years. and with time, they burn through the crust to form an underwater volcano which may eventually grow big enough to become an island.
But, because the crustal plate is in constant motion, the island will eventually move off of the hot spot. thereby making room for a second volcanic island. And a third, and a fourth…. Thus are archipelagos like the Galápagos formed.

Picture : Armand Vervaeck

In regions of extensive and repeated fissure eruptions, ridges are formed. Often these underwater ridges have substantial height (as much as 2,000 to 3,000 meters) and are considered to include the longest mountain chains in the world. As new oceanic crust forms at the ridges, older crust is progressively moved farther and farther from the ridge, creeping along at a rate of a few centimeters per year. This process is referred to as seafloor spreading. For this reason, we often refer to divergent boundaries as spreading boundaries. As the new oceanic crustal rock moves away from the heated ridge, it cools and contracts, decreasing the ridge height (i.e., increasing the water depth) of the ridge flanks.
Recently, the use of undersea submersibles has provided a window to view the mid-ocean ridges. Scientists have actually observed new ocean floor being produced as red-hot lava extrudes from active fissures, instantly “freezing,” or cooling, in the 2°C bottom water. Associated with the ridges are hydrothermal vents, where super-heated water, gases, and minerals escape from deep within the Earth.

Picture : Armand Vervaeck

Islands farthest from the hot spot are older and more eroded while islands near or on the hot spot are younger and steeper. Thus Isla San Cristóbal, the nearest to the mainland, is approximately four million years old and composed of eroded, rounded cones, while Isla Fernandina dates at less than 7000 years and is considered to be one of the most active volcanoes in the world. Recently former Galápagos islands, now submerged, have been discovered between Isla San Cristóbal and the mainland. This discovery may double the age of the islands. Indeed, several million years from now the present islands may likewise sink beneath the waves only to be replaced by a new set of Galápagos Islands. Who can imagine what course further evolution will take!?

Galapagos Earthquakes.
Although the Galapagos area is mainly a Hot Spot where the Nazca plate and the Cocos plate are pushed away from each other (divergent boundaries) , which allows molten lava to reach the earth’s surface, a small portion of the fault line is a transform fault where the 2 plates are striking along each other with regular earthquakes as a result (see graphic)

Galapagos volcanoes
Mid-ocean islands like the Galapagos are formed from basalt, the most basic of all types of lava.
Basalt has a very different chemical composition from the lavas that erupt from continental volcanoes, and is much more fluid. Consequently, as the lava flows build up to produce a volcanic cone, the island cones have a much shallower slope than those on the mainland.
These shallow-sloped volcanoes are called shield volcanoes and in the Galapagos, they are often compared to over-turned soup bowls.
Such shield volcanoes can clearly be seen in the younger western islands of Isabela and Fernandina. To the east, the volcanoes are lower and more eroded.

Galapagos volcanoes creation, erosion and constant movement - Graphic : courtesy Dr. Robert Rothman

(some text Courtesy – Dr. Robert Rothman, Professor Biological Sciences)
(Pictures and graphics : Dr. Robert Rothman, Armand Vervaeck and NOAA oceanexplorer)

%d bloggers like this: