What was the Richter Scale of the Tokyo earthquake which happend at 1923?
930382
The initial shock that lasted 4 minutes knocked out seismographs at the central weather bureau office in Tokyo so that a seismograph in Tokyo Imperial University made the only record of the series of more than 1,700 earthquakes that struck the Tokyo area over the following three days.? The maximum magnitudes of the earthquake measured between 7.9 and 8.3 on the Richter scale, with the epicenter located 50 miles southeast of Tokyo in Sagami Bay.
684386
(m)\n\nThe Twentieth Century's Largest Earthquake\n\n\nThree of the ten largest earthquakes of the twentieth century occurred in Alaska, striking in 1957, 1964, and 1965. The strongest of these (magnitude: 9.2) took place on Good Friday in 1964, hitting 80 miles east of Anchorage. The biggest earthquake of the century struck Chile on May 22, 1960. Its magnitude, the highest ever recorded, was 9.5. \n\nThe deadliest earthquake of all time is believed to have occurred on Jan. 24, 1556, in Shaanxi (Shensi) Province, China — 830,000 were killed.\n\n\nTsunami\n\n\nThe Alaskan Good Friday earthquake was followed by tsunami, or tidal waves, that reached 50 feet high and traveled a phenomenal 8,445 miles at 450 miles per hour. Tsunami is a Japanese term (tsu, port; nami, waves) presumably referring to the rising height of tsunami as they approach shore. \n\nBreaking on land, these tremendous waves can cause enormous destruction. The deadliest tsunami ever occurred on Dec, 26, 2004, killing more than 225,000 people and leaving millions homeless. \n\nIn addition to earthquakes, volcanoes can cause tsunami—after the eruption of Krakatoa on August 27, 1883, more than 36,000 people were killed by the tsunami alone.
883331
try this http://www.japantimes.co.jp/
945993
Earthquake, shaking of the Earth’s surface caused by rapid movement of the Earth’s rocky outer layer. Earthquakes occur when energy stored within the Earth, usually in the form of strain in rocks, suddenly releases. This energy is transmitted to the surface of the Earth by earthquake waves. The study of earthquakes and the waves they create is called seismology (from the Greek seismos, “to shake”). Scientists who study earthquakes are called seismologists.\n\nThe destruction an earthquake causes depends on its magnitude and duration, or the amount of shaking that occurs. A structure’s design and the materials used in its construction also affect the amount of damage the structure incurs. Earthquakes vary from small, imperceptible shaking to large shocks felt over thousands of kilometers. Earthquakes can deform the ground, make buildings and other structures collapse, and create tsunamis (large sea waves). Lives may be lost in the resulting destruction.\n\nEarthquakes, or seismic tremors, occur at a rate of several hundred per day around the world. A worldwide network of seismographs (machines that record movements of the Earth) detects about 1 million small earthquakes per year. Very large earthquakes, such as the 1964 Alaskan earthquake, which caused millions of dollars in damage, occur worldwide once every few years. Moderate earthquakes, such as the 1989 tremor in Loma Prieta, California, and the 1995 tremor in Kōbe, Japan, occur about 20 times a year. Moderate earthquakes also cause millions of dollars in damage and can harm many people.\n\nIn the last 500 years, several million people have been killed by earthquakes around the world, including over 240,000 in the 1976 T’ang-Shan, China, earthquake. Worldwide, earthquakes have also caused severe property and structural damage. Adequate precautions, such as education, emergency planning, and constructing stronger, more flexible, safely designed structures, can limit the loss of life and decrease the damage caused by earthquakes.
112332
It's a read-out from a Seismometer\n---------------------------\nSeismometer (in Greek seismos = earthquake and metero = measure) are used by seismologists to measure and record seismic waves. By studying seismic waves, geologists can map the interior of the Earth, and measure and locate earthquakes and other ground motions. The term seismograph is usually interchangeable, but seismometer seems to be a more common usage.\n\nThe seismometer was first invented by Zhang Heng in China in 132AD.\n\nLater John Milne invented the horizontal pendulum seismograph at the Imperial College of Engineering in Japan in 1880. This marked the beginning of modern seismology.\n\nBasic principles\nSeismometers have:\n\nA frame securely affixed to the earth. The foundation is critical, and often the most expensive part of a seismic station. \nAn inertial mass suspended in the frame by some method, using springs or gravity to establish a steady-state reference position. \nA damper system to prevent long term oscillations in response to an event. \nA means of recording the motion of the mass relative to the frame. Early seismometers used optics, or motion-amplifying mechanical linkages, while modern instruments use electronic amplification of signals generated by position or motion sensors. \nPassing seismic waves move the frame, while the mass tends to stay in a fixed position due to its inertia. The seismometer measures the relative motion between the frame and the suspended mass.\n\nProfessional seismic observatories usually have instruments measuring three axes, north-south, east-west, and up-down. Seismologists generally prefer a vertical seismograph if only one instrument is available.\n\nA professional station is sometimes mounted on bedrock with an uncracked connection to a continental plate. The best mountings may be in deep boreholes, which avoid thermal effects, ground noise and tilting from weather and tides. Amateur, or less exotic instruments are often mounted in insulated enclosures on small buried piers of unreinforced concrete. Reinforcing rods and aggregates would distort the pier as the temperature changes. A site should always be surveyed for ground noise with a temporary installation before pouring the pier and laying conduit.\n\nAn early example\nThe principle can be shown by an early special purpose seismometer. This consisted of a large stationary pendulum, with a stylus on the bottom. As the earth starts to move, the heavy mass of the pendulum has the inertia to stay still in the non-earth frame of reference. The result is that the stylus scratches a pattern corresponding with the earth's movement. This type of strong motion seismometer recorded upon a smoked glass (glass with carbon soot). While not sensitive enough to detect distant earthquakes, this instrument could indicate the direction of the initial pressure waves and thus help find the epicenter of a local earthquake — such instruments were useful in the analysis of the 1906 San Francisco earthquake. Further re-analysis was performed in the 1980s using these early recordings, enabling a more precice determination of the initial fault break location in Marin county and its subsequent progression, mostly to the south.\n\nEarly Designs\nAfter 1880, most seismometers were descended from those developed by the team of John Milne, James Alfred Ewing and Thomas Gray, who worked together in Japan from 1880-1895. These seismometers used damped horizontal pendulums. Later, after World War II, these were adapted into the widely-used Press-Ewing seismometer.\n\nLater, professional suites of instruments for the world-wide standard seismographic network had one set of instruments tuned to oscillate at fifteen seconds, and the other at ninety seconds, each set measuring in three directions. Amateurs or observatories with limited means tuned their smaller, less sensitive instruments to ten seconds.\n\nThe basic damped horizontal pendulum seismometer swings like the gate of
542054
an earthquake happens when tectonic plates move\n\nmountains happen when tectonic plates overlap
685931
http://earthquake.usgs.gov/eqcenter/recenteqsww/
336125
It is 1000 times stronger. The richter scale is an exponential scale. So from 1 to 2 is 10 times worse.
870278
The first link provides current and historical information regarding the fault.  The second link is to the history channel's web site which contains a brief overview of the Mega Disaster's episode on a possible future fault movement.\n\nhttp://quake.ualr.edu/public/nmfz.htm\nhttp://www.history.com/minisite.do?content_type=Minisite_Episodes&content_type_id=1435&display_order=3&mini_id=1401
1044728
The foci of earthquakes at transform boundaries tend to be at shallow depths.\n\nSee source.
128431
http://www.google.com/search?btnI=I%27m+Feeling+Lucky&q=wiki+richter+scale\nhttp://www.google.com/search?btnI=I%27m+Feeling+Lucky&q=wiki+mercalli+scale
66905
There is no other scale used, that I know of.\nThe Richter Scale is the scale used to measure magnitude of earthquakes. The link is a general discription of the scale.
1074898
Found this on Wikipedia, "The earthquake is considered an intraplate earthquake because it occurred a great distance from any plate boundary"
836415
I'm in Tokyo, watching TV. Its predicted to be about 1.5 feet in this area, closer to 6 feet in extreme northeast Hokkaido. as of 9:45pm JST
217048
http://www.bbc.co.uk/science/hottopics/naturaldisasters/earthquakes.shtml
348621
http://www.thunderstorm.co.nz/13th_december_2003.htm
386758
The most recent earthquake was in Central Alaska today (May 2) at 6:38 pm Universal Time, aka 2:38 pm Eastern Daylight time. The magnitude was 2.5 on the Richter Scale.