2015 Coquimbo earthquake
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The 2015 Illapel earthquake occurred offshore from
Illapel Illapel () is a Chilean city, which is the capital of the Choapa Province, Coquimbo Region. It lies along the Illapel River and marks the country's narrowest point along a parallel (94 km). It is located to the east of Los Vilos. Administrat ...
(
Coquimbo region The Coquimbo Region ( es, Región de Coquimbo, ) is one of Chile's 16 regions (first order administrative divisions). It is bordered by Atacama to the north, Valparaíso to the south, Argentina to the east, and the Pacific Ocean to the west. ...
,
Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...
) on September 16 at 19:54:32
Chile Standard Time Time in Chile is divided into three time zones. Most of Continental Chile uses the time offset UTC−04:00 in winter time and UTC−03:00 in summer time, while the Magallanes and Chilean Antarctica region uses the time offset UTC-03:00 the whol ...
(22:54:32 UTC), with a
moment magnitude The moment magnitude scale (MMS; denoted explicitly with or Mw, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment. It was defined in a 1979 pape ...
of 8.3–8.4. The initial quake lasted between three and five minutes; it was followed by several
aftershock In seismology, an aftershock is a smaller earthquake that follows a larger earthquake, in the same area of the main shock, caused as the displaced crust adjusts to the effects of the main shock. Large earthquakes can have hundreds to thousand ...
s greater than magnitude six and two that exceeded 7.0
moment magnitude The moment magnitude scale (MMS; denoted explicitly with or Mw, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment. It was defined in a 1979 pape ...
. The Chilean government reported 15 deaths, 6 missing and thousands of people affected. In
Buenos Aires Buenos Aires ( or ; ), officially the Autonomous City of Buenos Aires ( es, link=no, Ciudad Autónoma de Buenos Aires), is the capital and primate city of Argentina. The city is located on the western shore of the Río de la Plata, on South ...
,
Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...
, a man died from a
stroke A stroke is a medical condition in which poor blood flow to the brain causes cell death. There are two main types of stroke: ischemic, due to lack of blood flow, and hemorrhagic, due to bleeding. Both cause parts of the brain to stop functionin ...
while he was evacuating a building.


Earthquake

The
earthquake An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in intensity, from ...
occurred on
thrust faults A thrust fault is a break in the Earth's crust, across which older rocks are pushed above younger rocks. Thrust geometry and nomenclature Reverse faults A thrust fault is a type of reverse fault that has a dip of 45 degrees or less. If ...
along the boundary of the
Nazca Nazca (; sometimes spelled Nasca; qu, Naska) is a city and system of valleys on the southern coast of Peru. It is also the name of the largest existing town in the Nazca Province. The name is derived from the Nazca culture, which flourished in ...
and South American plates. The region frequently produces large earthquakes, and 15 others of magnitude 7 or higher have taken place within 400 km of the epicenter over the past 100 years. The last big quake that occurred in this region was the
1943 Ovalle earthquake The Coquimbo Region of Chile was affected by a major earthquake on 6 April 1943 at 12:07 local time (16:07 UTC). It had a magnitude of between 7.9 and 8.2 on the moment magnitude scale. It triggered a minor tsunami that caused local damage alon ...
, reaching a magnitude in the range 7.9–8.2; however, comparisons of the associated source time function (the time history of release of
seismic moment Seismic moment is a quantity used by seismologists to measure the size of an earthquake. The scalar seismic moment M_0 is defined by the equation M_0=\mu AD, where *\mu is the shear modulus of the rocks involved in the earthquake (in pascals (Pa) ...
) show that the 2015 event was significantly larger than the 1943 earthquake, in terms of duration, up-dip rupture extent and tsunami size. This earthquake had an unusual
foreshock A foreshock is an earthquake that occurs before a larger seismic event (the mainshock) and is related to it in both time and space. The designation of an earthquake as ''foreshock'', ''mainshock'' or aftershock is only possible after the full sequ ...
, just 20 seconds before the main 8.3 earthquake, reaching a magnitude of 7.2. This has been considered as one of the most complex earthquakes to be ever studied in Chile.


Damage and range

Illapel Illapel () is a Chilean city, which is the capital of the Choapa Province, Coquimbo Region. It lies along the Illapel River and marks the country's narrowest point along a parallel (94 km). It is located to the east of Los Vilos. Administrat ...
, an inland city of 30,000 residents, was reported immediately to be without electricity or drinking water. Many towns and small cities in the
Coquimbo region The Coquimbo Region ( es, Región de Coquimbo, ) is one of Chile's 16 regions (first order administrative divisions). It is bordered by Atacama to the north, Valparaíso to the south, Argentina to the east, and the Pacific Ocean to the west. ...
saw a lot of damage, where the earthquake was felt with an intensity of VIII
Mercalli The Modified Mercalli intensity scale (MM, MMI, or MCS), developed from Giuseppe Mercalli's Mercalli intensity scale of 1902, is a seismic intensity scale used for measuring the intensity of shaking produced by an earthquake. It measures the eff ...
. The panic took over the great cities like La Serena , Valparaiso and the capital
Santiago Santiago (, ; ), also known as Santiago de Chile, is the capital and largest city of Chile as well as one of the largest cities in the Americas. It is the center of Chile's most densely populated region, the Santiago Metropolitan Region, whose ...
. Two days after the quake, about 90,000 people were still without electricity. On September 21, officials were reporting over 9,000 people had been left homeless by the quake. Tall buildings swayed and car alarms were set off in
Buenos Aires Buenos Aires ( or ; ), officially the Autonomous City of Buenos Aires ( es, link=no, Ciudad Autónoma de Buenos Aires), is the capital and primate city of Argentina. The city is located on the western shore of the Río de la Plata, on South ...
, away, and the earthquake was felt in
São Paulo São Paulo (, ; Portuguese for 'Saint Paul') is the most populous city in Brazil, and is the capital of the state of São Paulo, the most populous and wealthiest Brazilian state, located in the country's Southeast Region. Listed by the GaWC a ...
, more than away. The Argentine provinces of Mendoza,
San Juan San Juan, Spanish for Saint John, may refer to: Places Argentina * San Juan Province, Argentina * San Juan, Argentina, the capital of that province * San Juan, Salta, a village in Iruya, Salta Province * San Juan (Buenos Aires Underground), ...
, Córdoba, Tucumán,
La Rioja La Rioja () is an autonomous community and province in Spain, in the north of the Iberian Peninsula. Its capital is Logroño. Other cities and towns in the province include Calahorra, Arnedo, Alfaro, Haro, Santo Domingo de la Calzada, and Nà ...
,
San Luis San Luis (Spanish for "Saint Louis") may refer to: Places Argentina * San Luis Province * San Luis, Argentina, capital of San Luis Province Belize * San Luis, Belize, in Orange Walk District Colombia * San Luis, Antioquia, a town and municipality ...
and Santa Fe were also affected.


Tsunami

Tsunami A tsunami ( ; from ja, 津波, lit=harbour wave, ) is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Earthquakes, volcanic eruptions and other underwater explo ...
watches, warnings, and advisories were issued in Ecuador, Peru, New Zealand,
Fiji Fiji ( , ,; fj, Viti, ; Fiji Hindi: फ़िजी, ''Fijī''), officially the Republic of Fiji, is an island country in Melanesia, part of Oceania in the South Pacific Ocean. It lies about north-northeast of New Zealand. Fiji consists ...
,
Solomon Islands Solomon Islands is an island country consisting of six major islands and over 900 smaller islands in Oceania, to the east of Papua New Guinea and north-west of Vanuatu. It has a land area of , and a population of approx. 700,000. Its capita ...
,
Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only stat ...
,
California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...
and Japan. The first tsunami waves arrived on the Chilean coast within minutes. A series of waves reaching at least high were observed along the coast of
Coquimbo Coquimbo is a port city, commune and capital of the Elqui Province, located on the Pan-American Highway, in the Coquimbo Region of Chile. Coquimbo is situated in a valley south of La Serena, with which it forms Greater La Serena with more than ...
and the cities of Coquimbo,
Tongoy Tongoy is a Chilean coastal town in the commune of Coquimbo in Elqui Province, Coquimbo Region. It is located to the south of Chile's second oldest city, La Serena, next to Guanaqueros beach, on a rocky promontory opposite the Pacific Ocean, ...
and
Concón Concón is a Chilean city and commune in Valparaíso Province, Valparaíso Region. It is a major tourist center known for its beaches, ''balnearios'' (beachside resorts) and night life. Geography The commune of Concón spans an area of . It is ...
nearby to Valparaiso reported flooding; large fishing vessels were swept into the streets of Coquimbo, which reported heavy damage. The port of Coquimbo, along with the Costanera, was heavily damaged. The tsunami also damaged the iconic La Serena monumental lighthouse. In the coastal city of
Tongoy Tongoy is a Chilean coastal town in the commune of Coquimbo in Elqui Province, Coquimbo Region. It is located to the south of Chile's second oldest city, La Serena, next to Guanaqueros beach, on a rocky promontory opposite the Pacific Ocean, ...
, large areas along the sea front were destroyed, along with the Tongoy beach itself, which was heavily affected by both earthquake and tsunami. Across the region at least 500 buildings were destroyed, while dozens of beachfront homes in
Los Vilos Los Vilos (From mapuche: ''Filu'', ‘snake’) ? is both a Chilean coastal commune and a coastal city with over 9,000 inhabitants (18,275 in comuna), located in the Province of Choapa, part of the IV Region of Coquimbo. The city has a harbour c ...
were damaged or destroyed. A state of emergency was declared in Coquimbo a day after the tsunami, with troops to be deployed to the area.


Evacuations

Chilean authorities ordered the immediate evacuation of the coast due to tsunami risk, with many people in coastal areas receiving automatic notices by cellphone shortly after the quake. The undersecretary for the ministry of the interior and public security reported that the evacuation affected one million people across the country. Although causing significant damage, the Illapel earthquake's low death toll relative to the 525 casualties of the significantly more powerful
2010 Chile earthquake The 2010 Chile earthquake and tsunami ( es, Terremoto del 27F) occurred off the coast of central Chile on Saturday, 27 February at 03:34 local time (06:34 UTC), having a magnitude of 8.8 on the moment magnitude scale, with intense shaking la ...
was credited, in part, to its occurrence in a less-populated region, better coastal preparedness and an improved tsunami warning system, the longstanding enforcement of seismic building codes, and an improved emergency response.


See also

*
2010 Chile earthquake The 2010 Chile earthquake and tsunami ( es, Terremoto del 27F) occurred off the coast of central Chile on Saturday, 27 February at 03:34 local time (06:34 UTC), having a magnitude of 8.8 on the moment magnitude scale, with intense shaking la ...
*
List of earthquakes in 2015 This is a list of earthquakes in 2015. Only earthquakes of magnitude 6 or above are included, unless they result in damage and/or casualties, or are notable for some other reason. All dates are listed according to UTC (Coordinated Universal Time ...
*
List of earthquakes in Chile __NOTOC__ Chile lay in a region which is adjacent to the fast-moving Nazca Plate, and has high tectonic activity. The records for earlier centuries are apparently incomplete. Of the world's 46 known earthquakes with M ≥ 8.5 since the year 1 ...


References


Further reading

* *


External links

* * {{Portal bar, Chile, Earth sciences
Illapel Illapel () is a Chilean city, which is the capital of the Choapa Province, Coquimbo Region. It lies along the Illapel River and marks the country's narrowest point along a parallel (94 km). It is located to the east of Los Vilos. Administrat ...
Illapel Illapel () is a Chilean city, which is the capital of the Choapa Province, Coquimbo Region. It lies along the Illapel River and marks the country's narrowest point along a parallel (94 km). It is located to the east of Los Vilos. Administrat ...
Illapel earthquake Illapel 2015 Illapel 2015 Illapel earthquake History of Coquimbo Region