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Out Of Mind » SOLAR & PLANETARY ALERTS & INFO » EARTH CHANGES » 6.8 quake strikes off Taiwan, tsunami alert issued for southwestern Japan

6.8 quake strikes off Taiwan, tsunami alert issued for southwestern Japan

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PurpleSkyz

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6.8 quake strikes off Taiwan, tsunami alert issued for southwestern Japan
Published time: April 20, 2015 02:08
Edited time: April 20, 2015 02:46
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Tsunami advisories have been issued for Japan’s Miyakojima and Yaeyama areas following a shallow 6.8-magnitude underwater earthquake between the coasts of Okinawa and Taiwan.
Japan Meteorological Agency has issued tsunami advisories for the Miyakojima and Yaeyama areas of Japan. While JMA issued alerts of high wave activity affecting Japan’s southwestern islands, the Pacific Tsunami Warning Center said that there was no threat of a tsunami after the quake.
Waves as high as one meter are expected to hit southwestern territories, Japan's broadcaster NHK said, also warning that smaller waves could potentially strike other islands.
The epicenter of the strong 6.8-magnitude earthquake was located between Okinawa and Taiwan, with Taiwan's Central Weather Bureau measuring it slightly lower, at 6.3.


Thanks to: http://rt.com/



  

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PLANETARY TREMORS: Very Strong 6.8 Magnitude Earthquake Hits Taiwan - Buildings Sway In Taipei; Tsunami Alert Issued For Southwestern Japan! [MAPS + TECTONIC SUMMARY]


Earthquake 3D map.

April 19, 2015 - TAIWAN
- Tsunami advisories have been issued for Japan’s Miyakojima and Yaeyama areas following a shallow 6.8-magnitude underwater earthquake between the coasts of Okinawa and Taiwan.

The U.S. Geological Survey (USGS) recorded the temblor with a 6.6 magnitude.

Japan Meteorological Agency has issued tsunami advisories for the Miyakojima and Yaeyama areas of Japan.

While JMA issued alerts of high wave activity affecting Japan’s southwestern islands, the Pacific Tsunami Warning Center said that there was no threat of a tsunami after the quake.



USGS shakemap intensity.

Waves as high as one meter are expected to hit southwestern territories, Japan's broadcaster NHK said, also warning that smaller waves could potentially strike other islands. There was no warning issued for the main Okinawa island.

“We want residents to get as far as possible from the sea,”
Satoshi Shimoji of the Miyako City government told NHK, as cited by AFP. “We are issuing warnings via the radio.”

The epicenter of the strong 6.8-magnitude earthquake was located between Okinawa and Taiwan, with Taiwan's Central Weather Bureau measuring it slightly lower, at 6.3.

The epicenter of the quake was about 75 kilometers from Taiwan’s eastern coast at a depth of approximately 17 km. Witnesses reported buildings shaking in Taipei, the capital city of Taiwan, but no damage was recorded. - RT.



Tectonic Summary - 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 (Magnitude greater than 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.


USGS plate tectonics for the region.

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 (Magnitude greater than 8.0) earthquakes and 250 large (Magnitude greater than 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

- USGS.

Thanks to: http://thecelestialconvergence.blogspot.com/



  

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