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To announce the growing possibility of M9 earthquakes seismic waves echo back from the observed VHF. Echo began to be observed in seismic stations Erimo channels from 89.9MHz June 27, 2010 date back about 8 months before the earthquake off the coast of the northeastern Pacific Ocean on March 11, 2011.
This frequency echoes from seismic monitoring stations Nakashibetsu several other stations in the station's frequency is Nakashibetsu eastern Hokkaido was not confirmed that. The same frequency Kuzumaki station, Wajima, a small echo amplitude and Kobe earthquakes are located (-100 ~-110dB-up 3 4dB) from the station or not any audio signal is unknown, considered a strong possibility of the Tohoku region Kuzumaki.
This earthquake lasted eight months and echoes, in March 2011 occurred foreshock of M7.3 occurred the 3 days before the M9.0 finally weakened. That the M7.3 foreshock has revealed that very small group in the b value of 0.5 aftershocks that follow.
However, M9 has occurred during the verification process. The total duration of the echo of the earthquake may have more than 200,000 minutes past the M8. Daily is shown in Figure echo duration from 01 earthquakes in January 2010. The horizontal axis of the month from 01 January 2010, the vertical axis of the echo duration earthquakes per day (minutes). After an M9.0, earthquake activity is a weak echo, early begun to revitalize the M7.0 earthquake occurred Iwaki.
We follow the course very similar to the situation observed in the second half of last year and now.
The total duration of the echo-minute earthquake has reached 160,000. If you follow the same course as before the earthquake of March 11, if this still is estimated that the M9 class earthquake occurs again. Would be considered near the epicenter off the coast of southern Japan Trench off the southern part of Miyagi Prefecture, Ibaraki Prefecture.
Positive if the source mechanism is also considered a potential giant tsunami amplitude of fluctuations above and below the ocean crust is greater. Generation time is probably spent in December to January 2012, just from the expected weakening of the seismic echo is probably difficult to pinpoint.
Natural phenomena that trigger the occurrence of foreshocks and earthquake is also important to monitor the storm and tidal observations, such as words. Do not continue to go missing observations of VHF echoes the future earthquake, we will be updating as often as possible.
Originally posted by vox2442
reply to post by Highlander64
Please take the time to read this link:
Japan Meteorological Agency Seismic Intensity Scale.
It might help you understand a few things.
(wiki) - note no quakes or tsunamis related to fukushima province ....
The Sanriku coast of Japan has experienced significant seismic activity. On June 15, 1896, an earthquake measuring 8.5 M, the 1896 Meiji-Sanriku earthquake occurred off the coast of Sanriku in Iwate Prefecture, causing a tsunami of 25 metres (82 ft) 35 minutes after the quake which destroyed hundreds of houses and killed over 27,000 people. Tsunami were also observed in Hawaii and in California
The powerful earthquake produced earthquake liquefaction in the region. Ground fissures and failures caused major structural damage in several communities, much damage to property and several landslides. Anchorage sustained great destruction or damage to many inadequately engineered houses, buildings, and infrastructure (paved streets, sidewalks, water and sewer mains, electrical systems, and other man-made equipment), particularly in the several landslide zones along Knik Arm.
Two hundred miles southwest, some areas near Kodiak were permanently raised by 30 feet (9.1 m). Southeast of Anchorage, areas around the head of Turnagain Arm near Girdwood and Portage dropped as much as 8 feet (2.4 m), requiring reconstruction and fill to raise the Seward Highway above the new high tide mark.
In Prince William Sound, Port Valdez suffered a massive underwater landslide, resulting in the deaths of 30 people between the collapse of the Valdez city harbor and docks, and inside the ship that was docked there at the time. Nearby, a 27-foot (8.2 m) tsunami destroyed the village of Chenega, killing 23 of the 68 people who lived there; survivors out-ran the wave, climbing to high ground.
Post-quake tsunamis severely affected Whittier, Seward, Kodiak, and other Alaskan communities, as well as people and property in British Columbia, Oregon, and California. Tsunamis also caused damage in Hawaii and Japan. Evidence of motion directly related to the earthquake was reported from all over the earth.
Twelve people were killed by the tsunami in or near Crescent City, California, while four children were killed on the Oregon coast at Beverly Beach State Park.Other towns along the U.S. Pacific Northwest and Hawaii were damaged. Minor damage to boats reached as far south as Los Angeles.
As the entire planet vibrated as a result of the quake, minor effects were felt worldwide. Several fishing boats were sunk in Louisiana, and water sloshed in wells in Africa
Originally posted by Highlander64
ever wonder why the tsunami warnings did not go off in Japan?
was something above Mag.8,2!