SISMO MAYOR EN TOCOPILLA

SISMO MAYOR EN TOCOPILLA

Un Sismo Mayor, de magnitud 7.7 Mw, ha tenido lugar a 40 Kms de profundidad en las cercanías de Tocopilla. Los parámetros preliminares de este sismo y sus réplicas son los siguientes:

FECHA / HORA (UTC) / LAT. / LONG / PROFUNDIDAD / MAGNITUD
20071114 154050.xx -22.18 -69.81 40 Kms 7.70 MwUSGS
20071114 174404.xx -23.22 -70.53 38 Kms 5.70 mbGS
20071114 175330.xx -23.24 -70.54 34 Kms 4.90 mbGS
20071114 175651.xx -23.23 -70.50 49 Kms 4.60 mbGS
20071114 185549.xx -22.74 -70.35 32 Kms 5.00 mbGS
20071114 191725.xx -22.37 -69.93 48 Kms 4.80 mbGS
20071115 014635.xx -23.18 -70.52 14 Kms 5.00 mbGS
20071115 111451.xx -23.18 -70.77 27 Kms 5.00 mbGS
20071115 150309.xx -22.81 -70.31 27 Kms 6.20 MwUSGS
20071115 150601.xx -22.88 -70.07 35 Kms 6.80 MwUSGS
20071115 151549.xx -22.64 -70.16 28 Kms 5.60 mbGS
20071115 154550.xx -22.99 -70.65 36 Kms 4.80 mbGS
20071115 210535.xx -23.13 -70.42 35 Kms 4.80 mbGS
20071115 211207.xx -22.78 -70.67 35 Kms 4.80 mbGS

Su profundidad lo sitúa en la Placa Continental por sobre la Placa descendente de Nazca y su ocurrencia tiene lugar casi cuatro meses luego de haberse reanudado la actividad en el área del Codo de Arica con el sismo a profundidad mayor del día 2007 07 21. (Ver http://sismoarica.blogspot.com/)

El Mapa de Sismicidad para el Terremoto de Iquique ha sido reactualizado (Ahora, Terremotos de Iquique y Tocopilla). El Mapa de Sismicidad del Sector Centro Norte también ha sido actualizado.

GLOBAL SEISMICITY MAP

The global seismicity map for magnitudes = or > 8.0 has been updated with earthquakes to 2007 10 20. There has been 5 Big earthquakes so far this year and preliminary parameters are:

DATE / TIME (UTC) /LAT. / LONG / DEPTH / MAGNITUDE

2007 01 13 / 042321.16 / 46.24 / 154.52 / 10 / 8.20 Ms GS

2007 04 01 /203956.38 / -8.46 / 157.04 / 10 / 8.10 MwGCMT

2007 08 15 /234057.89 /-13.39 / -76.60 / 39 / 8.00 MwGCMT

2007 09 12 /111026.63 / -4.50 / 101.36 / 34 / 8.50 Ms GS

2007 09 12 /234903.75 / -2.62 / 100.85 / 35 / 8.10 Ms GS

GRAN SISMO EN PERU

Un Gran Sismo ha tenido lugar en la costa de Perú a la altura de Chincha Alto. El sismo tiene lugar a los 92 días de haber sido emitida la alarma de "Entrada al Umbral del Sismo Mayor" para la Zona de Subducción de la PLACA DE NAZCA.

El Gran Sismo ocurre muy próximo a dos Sismos Fuerte que tuvieron lugar en esa ubicación el 2006 10 20 y 2006 10 26. Un Mapa de Sismicidad actualizado ha sido publicado en el sitio que emitió la alerta el 12 de Mayo pasado.

http://sismofuturo.blogspot.com/

Mapa Sismicidad Aysen actualizado a 2007 04 02

Luego de publicada esta entrada, un Sismo Fuerte ha tenido lugar el día 21 de Abril en la Provincia de Aysen. Para mayor información, favor acceder a:

http://sismoaysen.blogspot.com/

UPDATED SEISMICITY MAP FOR AYSEN PROVINCE, CHILE

El siguiente es el registro de sismos de magnitud leve (>4.0) y moderada (>5.0) en la provincia de Aysen desde el 22 de Enero 2007:

The seismicity map for Aysen province in southern Chile has been updated with new earthquakes registered up to March 15th 2007. The preliminary parameters for these are:

DATE / TIME (UTC) / LAT. / LONG. / DEPTH / MAGNITUDE

FECHA / HORA (GMT) / LAT. / LONG. / PROFUNDIDAD / MAGNITUD

2007 01 23 204016.30 -45.31 -72.19 32 5.20 MLGUC

2007 01 24 025104.19 -45.30 -72.53 35 4.70 mb GS

2007 01 28 025320.85 -45.16 -72.32 49 4.40 mb GS

2007 01 31 080614.69 -45.19 -72.33 15 4.80 mb GS

2007 02 03 090015.79 -45.24 -72.24 10 5.10 mb GS

2007 02 23 195548.63 -45.33 -72.28 25 5.60 mb GS

En el Mapa de Sismicidad, las fechas en azul corresponden a sismos de este año (2007). Las fechas en negro corresponden a algunos sismos ocurridos durante la erupción del volcán Hudson en 1991. También hubo dos sismos el 14 Febrero del año 2000. (PINCHANDO EL MAPA APARECE IMAGEN JPG EN MAYOR TAMAÑO)

The data in blue letters corresponds to 2007 seismicity, while data for seismicity of the 1991 Hudson Volcano eruption is in black colour. There were also two moderate earthquakes in the year 2000, Feb. 14th.

SEISMICITY MAP PRE AND POST SUMATRA MEGA EARTHQUAKE, LINKED

The Seismicity Map shows earthquakes magnitude > 7.0, starting three months before the Sumatra Mega Earthquake of 2004 12 26. Earthquakes are linked according to date. There were seven earthquakes in the three months prior to 2004 12 26 and twenty six earthquakes in the twenty seven months post 2004 12 26.

The Seismicity Map is also available unlinked and should anyone feel it ought to be published, please leave a note.

NEW MODERATE EARTHQUAKE IN AYSEN AND LINKED BIG EARTHQUAKE 1960 05 22

A new earthquake has taken place in Aysen only 9 miles away from the other two moderate earthquakes which peked the seismic swarm in Aysen, southern Chile. The 5.60 mb GS magnitude seism is the third in the area and highest so far.

The preliminary parameters of this new seism are:

DATE / TIME (UTC) / LAT. / LONG. / DEPTH / MAGNITUDE

2007 02 23 / 195549 / -45.26 / -72.02 / 24 Km / 5.60 mb GS

A few miles nearer to the surface, the magnitude of 5.60 mbGS makes it the strongest in many years in the area. The third moderate earthquake since Jan 23rd, a month ago, is still some 100 Kms from the Aysen fjord where at the seismic swarm has been located.

The (linked) map for Big earthquake 1960 05 22 has been added. The rupture of some 1000 Kms is shown as a sequence of aftershocks which extend well beyond 1961, 1963 and 1967. The last major earthquakes hit the mainshock area in 1974 and 1975.

ALASKA KAMTCHAKA SEIMICITY MAP

The map has been added with no comments for your information.

SEISMIC SWARM IN AYSEN CHILE and Big Earthquake 1960 05 21 map.

The Seismicity Map shows, with dates in blue, seismicity of magnitude > 5.0 mb, around the Hudson Volcano from 1990 to 2000, and a short distance North-East, the two moderate earthquakes so far, in a much publicized swarm that has kept people, scientists and the press worried day and night. However, the abundant tremors have all been of lesser magnitudes (mb<>

The situation is reminiscent of abundant seismicity in June 2006 in the Alaska Subduction Zone. However, in that instance nothing happened close to the swarm location, instead two Big Earthquakes (Magnitude > 8.0) took place South West of Alaska at the Kuril Islands, same subduction zone.

The Map of Big Earthquake 1960 05 21 has been added. It shows the sequence of major earthquakes and the 8.5 Ms magnitude Big Earthquake of 1960 05 22 (World's biggest), together with associated seismicity and earthquakes magnitude > 6.0 Mw. The rupture took fifteen days to reach below the Hudson Volcano which later erupted in 1991. The 1960 05 21 sequence may have lasted until 1974. No major activity has taken place in the area since.

GLOBAL SEISMICITY ZONES

The Global Map has been divided into 16 zones according to each area's characteristic location. The Global Map only shows Big Earthquakes (Magnitud > 8.0). Taking into account seismicity > 7.0 (major and Big Earthquakes) for the period 1973 01 01 thru 2006 12 31, zones number 9 (Sumatra 20.5%) and number 6 (Tonga 18%) are the most seismic zones in the world. Next come zones number 5 (Japan and Philipines 10.3 %) , number 1 (Nazca Plate Subduction Zone 9.5 %) and number 4 (Alaska and Kamtchaka 8.2%). Zone number 10 accounts for 5.6%, and zones number 2, number 3, number 8, number 11 and number 12 account for around 3 % of total global seismicity.

Taking into account a longer period of time, 1940 thru 2006, some positions change, but overall, the pattern of seismicity holds. Extrangely enough, this same pattern of seismicity that you see in the Global Map for Big Earthquakes in 30 or 60 years, you see for a period of 30 to 60 days if you take into account earthquakes of magnitude > 4.0 or > 5.0.

The Global Map shows four Big Earthquakes of magnitude = or > 8.4. These are Sumatra (9.0), Antartic Plate (8.8), Alaska (8.5) and Southern Peru (8.4).

NAZCA PLATE SUBDUCTION ZONE SEISMICITY

Seismicity at the NPSZ as, detailed in this map, is quite staightforward if you look at it from right to left. The red coloured circles represent Extra Deep Earthquakes (EDE's) with depths ranging from 500Kmsto 670 Kms. These EDE's occurr at the bottom limit of the subducting Nazca plate, where at, melting of the materials take place, therefore no more earthquakes beyond this limit. EDE's range from the Equator (0º) south to the -30 º Latitude. There are no EDE's south from this latitude or north from the Equator. Also, EDE's are located below the flat lands East from the Andes Mountains.

The blue coloured circles represent Very Deep Earthquakes (VDE's) with depths ranging from 175 Kms to 330 Kms which take place mostly under the eastern rise ofthe Andes Mountains. Only a few earthquakes occurr at depths in between 350 and 450 Kms (the transition zone of earth's inner layers) and one of them is present close to the latitude-20º, longitude - 65º intersection (this 6.1 Mw magnitude earthquake took place on 2004 03 27 and is coloured purple).

The double blue line joining the orange coloured circles on the eastern limit of the Andes Mountains represent Surface Level Out Of Place Seisms (SLOOPS or CRE's for Crust Response Earthquakes), earthquakes which take place at upper crust levels and which do not belong to the subducting plate process but to the longitudinal shortening of the continent, caused instead by the Mid Atlantic Ridge weternly push. This process of shortening creates the rising of the Andes Mountains.

Under the western rise of the Andes Mountains, the green coloured circles represent Medium Depths Eathquakes (MDE's or IDE's) at the intermediate depths of 75 Kms to 175 Kms. MDE's at depths 90-110 Kms follow the line under the AndesMountains highest's peaks and this depths is the usual source to magma in the volcanic processes.

Yellow circles near the coastal line represent earthquakes at depths in between 40 and 75 Kms. Some of these earthquakes are situated below the subducting plate and areOut of Place Seisms (OOPS's or MRE's for Mantle Reponse Earthquakes)

Orange Circles near the Coast Line represent earthquakes at depths of 0 to 39 Kms. Most of the earthquakes at the subduction zone take place at these depths and certainly the most violent ones too because of their closeness to the surface.