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Out Of Mind » SOLAR & PLANETARY ALERTS & INFO » EARTH CHANGES » 7.2 EarthQuake/CERN Cranks Back Up.

7.2 EarthQuake/CERN Cranks Back Up.

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1 7.2 EarthQuake/CERN Cranks Back Up. on Fri Apr 28, 2017 7:24 pm

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2 Re: 7.2 EarthQuake/CERN Cranks Back Up. on Fri Apr 28, 2017 7:24 pm

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3 Re: 7.2 EarthQuake/CERN Cranks Back Up. on Fri Apr 28, 2017 7:59 pm

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Very strong M6.8 earthquake hits Philippines, tsunami warnings issued



Posted by TW on April 28, 2017 in categories Featured articles, Seismic activity, Tsunami





A very strong and shallow earthquake registered by the USGS as M6.8 (downgraded from M7.2) hit near the coast of Mindanao, Philippines at 20:23 UTC on April 28, 2017 (04:23 local time on April 29). The agency is reporting a depth of 41.7 km (25.9 miles). PHIVOLCS is reporting M7.2 at a depth of 87 km (54 miles). (EMSCGFZ Potsdam). Tsunami warnings have been issued.
According to the USGS, the epicenter was located 26.8 km (16.6 mi) WSW of Balangonan (population 2 329) and 36.4 km (22.6 mi) SSW of Glan (population 24 256), Philippines.
There are 1 802 246 people living within 100 km (62 miles). EMSC estimated there are 6.2 million people in the felt area.
Based on the preliminary earthquake parameters (M7.2), hazardous tsunami waves are possible for coasts located within 300 km (186 miles) of the earthquake epicenter, PTWC said at 20:29 UTC.
PTWC Tsunami Threat Message No2 issued 20:52 UTC (M6.9 / depth 43 km (27 miles)):
"Based on all available data, hazardous tsunami waves are forecast for some coasts. Tsunami waves reaching 0.3 to 1 meters (1 - 3.3 feet) above the tide level are possible for some coasts of Philippines. Tsunami waves are forecast to be less than 0.3 meters above the tide level for the coasts of Indonesia, Malaysia, Palau and Yap."
ESTIMATED TIMES OF ARRIVAL
--------------------------

* ESTIMATED TIMES OF ARRIVAL -ETA- OF THE INITIAL TSUNAMI WAVE
FOR PLACES WITHIN THREATENED REGIONS ARE GIVEN BELOW. ACTUAL
ARRIVAL TIMES MAY DIFFER AND THE INITIAL WAVE MAY NOT BE THE
LARGEST. A TSUNAMI IS A SERIES OF WAVES AND THE TIME BETWEEN
WAVES CAN BE FIVE MINUTES TO ONE HOUR.

LOCATION REGION COORDINATES ETA(UTC)
------------------------------------------------------------
DAVAO PHILIPPINES 6.8N 125.7E 2053 04/28
COTABUTO CITY PHILIPPINES 7.3N 124.2E 2053 04/28
ZAMBOANGA PHILIPPINES 7.0N 122.3E 2148 04/28
LEGASPI PHILIPPINES 13.2N 123.8E 2206 04/28
PALANAN PHILIPPINES 17.1N 122.6E 2221 04/28


POTENTIAL IMPACTS
-----------------

* A TSUNAMI IS A SERIES OF WAVES. THE TIME BETWEEN WAVE CRESTS
CAN VARY FROM 5 MINUTES TO AN HOUR. THE HAZARD MAY PERSIST
FOR MANY HOURS OR LONGER AFTER THE INITIAL WAVE.

* IMPACTS CAN VARY SIGNIFICANTLY FROM ONE SECTION OF COAST TO
THE NEXT DUE TO LOCAL BATHYMETRY AND THE SHAPE AND ELEVATION
OF THE SHORELINE.

* IMPACTS CAN ALSO VARY DEPENDING UPON THE STATE OF THE TIDE AT
THE TIME OF THE MAXIMUM TSUNAMI WAVES.

* PERSONS CAUGHT IN THE WATER OF A TSUNAMI MAY DROWN... BE
CRUSHED BY DEBRIS IN THE WATER... OR BE SWEPT OUT TO SEA.
At 21:03 UTC (05:03 local time), PHIVOLCS issued the following [url=http://www.phivolcs.dost.gov.ph/html/update_SOEPD/2017_Tsunami_Information/April/2 - Tsunami Advisory - Minor Sea Level Disturbance- Celebes Sea.pdf]tsunami advisory[/url]:
A strong earthquake with a preliminary magnitude of 7.3 occurred Sarangani on (2017/04/29) at 04:23 AM (Philippine Standard Time) located at 05.48 oN, 125.32 oE with depth of 87 km.
SEA LEVEL DISTURBANCES such as strong currents and rapid rise and fall of seawaters are expected. The concerned public is advised to be on alert for unusual waves. Based on tsunami wave models and early tide gauge records of the tsunami in the Philippine Sea, coastal areas in Philippine provinces fronting the Celebes Sea are expected to experience wave heights of less than one meter above the normal tide levels. The first tsunami waves will arrive between 4:28 AM to 5:23 AM, (2017/04/29) (PST) and may not be the largest. These waves may continue for hours.
People are advised to STAY AWAY FROM THE BEACH AND NOT TO GO TO THE COAST fronting Celebes Sea of the following provinces during this period 4:28 AM to 5:23 AM and until the threat has passed:
Sarangani, Davao Occidental, South Cotabato, Davao Oriental, and Sultan Kudarat.

USGS issued a green alert for shaking-related fatalities and economic losses. There is a low likelihood of casualties and damage.
Overall, the population in this region resides in structures that are a mix of vulnerable and earthquake resistant construction. The predominant vulnerable building types are reinforced concrete and unknown/miscellaneous types construction.
Recent earthquakes in this area have caused secondary hazards such as landslides that might have contributed to losses.

Estimated population exposure to earthquake shaking


Selected cities exposed


Regional seismicity


Seismotectonics of the Philippine Sea and vicinity

The Philippine Sea plate is bordered by the larger Pacific and Eurasia plates and the smaller Sunda plate. The Philippine Sea plate is unusual in that its borders are nearly all zones of plate convergence. The Pacific plate is subducted into the mantle, south of Japan, beneath the Izu-Bonin and Mariana island arcs, which extend more than 3,000 km along the eastern margin of the Philippine Sea plate. This subduction zone is characterized by rapid plate convergence and high-level seismicity extending to depths of over 600 km. In spite of this extensive zone of plate convergence, the plate interface has been associated with few great (M>8.0) ‘megathrust’ earthquakes. This low seismic energy release is thought to result from weak coupling along the plate interface (Scholz and Campos, 1995). These convergent plate margins are also associated with unusual zones of back-arc extension (along with resulting seismic activity) that decouple the volcanic island arcs from the remainder of the Philippine Sea Plate (Karig et al., 1978; Klaus et al., 1992).
South of the Mariana arc, the Pacific plate is subducted beneath the Yap Islands along the Yap trench. The long zone of Pacific plate subduction at the eastern margin of the Philippine Sea Plate is responsible for the generation of the deep Izu-Bonin, Mariana, and Yap trenches as well as parallel chains of islands and volcanoes, typical of circum-pacific island arcs. Similarly, the northwestern margin of the Philippine Sea plate is subducting beneath the Eurasia plate along a convergent zone, extending from southern Honshu to the northeastern coast of Taiwan, manifested by the Ryukyu Islands and the Nansei-Shoto (Ryukyu) trench. The Ryukyu Subduction Zone is associated with a similar zone of back-arc extension, the Okinawa Trough. At Taiwan, the plate boundary is characterized by a zone of arc-continent collision, whereby the northern end of the Luzon island arc is colliding with the buoyant crust of the Eurasia continental margin offshore China.
Along its western margin, the Philippine Sea plate is associated with a zone of oblique convergence with the Sunda Plate. This highly active convergent plate boundary extends along both sides the Philippine Islands, from Luzon in the north to the Celebes Islands in the south. The tectonic setting of the Philippines is unusual in several respects: it is characterized by opposite-facing subduction systems on its east and west sides; the archipelago is cut by a major transform fault, the Philippine Fault; and the arc complex itself is marked by active volcanism, faulting, and high seismic activity. Subduction of the Philippine Sea Plate occurs at the eastern margin of the archipelago along the Philippine Trench and its northern extension, the East Luzon Trough. The East Luzon Trough is thought to be an unusual example of a subduction zone in the process of formation, as the Philippine Trench system gradually extends northward (Hamburger et al., 1983). On the west side of Luzon, the Sunda Plate subducts eastward along a series of trenches, including the Manila Trench in the north, the smaller less well-developed Negros Trench in the central Philippines, and the Sulu and Cotabato trenches in the south (Cardwell et al., 1980). At its northern and southern terminations, subduction at the Manila Trench is interrupted by arc-continent collision, between the northern Philippine arc and the Eurasian continental margin at Taiwan and between the Sulu-Borneo Block and Luzon at the island of Mindoro. The Philippine fault, which extends over 1,200 km within the Philippine arc, is seismically active. The fault has been associated with major historical earthquakes, including the destructive M7.6 Luzon earthquake of 1990 (Yoshida and Abe, 1992). A number of other active intra-arc fault systems are associated with high seismic activity, including the Cotabato Fault and the Verde Passage-Sibuyan Sea Fault (Galgana et al., 2007).
Relative plate motion vectors near the Philippines (about 80 mm/yr) is oblique to the plate boundary along the two plate margins of central Luzon, where it is partitioned into orthogonal plate convergence along the trenches and nearly pure translational motion along the Philippine Fault (Barrier et al., 1991). Profiles B and C reveal evidence of opposing inclined seismic zones at intermediate depths (roughly 70-300 km) and complex tectonics at the surface along the Philippine Fault.
Several relevant tectonic elements, plate boundaries and active volcanoes, provide a context for the seismicity presented on the main map. The plate boundaries are most accurate along the axis of the trenches and more diffuse or speculative in the South China Sea and Lesser Sunda Islands. The active volcanic arcs (Siebert and Simkin, 2002) follow the Izu, Volcano, Mariana, and Ryukyu island chains and the main Philippine islands parallel to the Manila, Negros, Cotabato, and Philippine trenches.
Seismic activity along the boundaries of the Philippine Sea Plate (Allen et al., 2009) has produced 7 great (M>8.0) earthquakes and 250 large (M>7) events. Among the most destructive events were the 1923 Kanto, the 1948 Fukui and the 1995 Kobe (Japan) earthquakes (99,000, 5,100, and 6,400 casualties, respectively), the 1935 and the 1999 Chi-Chi (Taiwan) earthquakes (3,300 and 2,500 casualties, respectively), and the 1976 M7.6 Moro Gulf and 1990 M7.6 Luzon (Philippines) earthquakes (7,100 and 2,400 casualties, respectively). There have also been a number of tsunami-generating events in the region, including the Moro Gulf earthquake, whose tsunami resulted in more than 5000 deaths.
More information on regional seismicity and tectonics
Featured image credit: USGS

Thanks to: https://watchers.news



  

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