Mallow Posted March 15, 2011 Share Posted March 15, 2011 Wait-- I'm confused. The USGS map now shows the center E of Tokyo, near the E coast of Honshu. Did it shift from the initial estimate? Looks like there were two 6+ aftershocks at about the same time: http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc00023fx.php#maps http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc0001xka.php#maps One east and one west of Tokyo? Really? Link to comment Share on other sites More sharing options...
HurricaneJosh Posted March 15, 2011 Share Posted March 15, 2011 Shallow depth to the 6.1 magnitude quake, only 1km deep. Wow-- that is really, really shallow. The shaking at the surface must have been crazy. Link to comment Share on other sites More sharing options...
HurricaneJosh Posted March 15, 2011 Share Posted March 15, 2011 Looks like there were two 6+ aftershocks at about the same time: http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc00023fx.php#maps http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/usc0001xka.php#maps One east and one west of Tokyo? Really? Yeah, that's what confused me. That is crazy for two big events like that to happen on either side of a major megalopolis. I wonder how hard Tokyo shook in each of these. It's just out of control. Any one of these events by itself would be a major newsmaker. It's seismic diarrhea. Link to comment Share on other sites More sharing options...
Mallow Posted March 15, 2011 Share Posted March 15, 2011 Wow-- that is really, really shallow. The shaking at the surface must have been crazy. For whatever reason, it's "only" estimated to have a maximum shaking intensity of around VII: http://earthquake.usgs.gov/earthquakes/pager/events/us/c00023fx/exposure_small.png Maybe the fact that it was centered in a mountainous area? Or maybe it's a kind of fault that doesn't produce as strong surface waves. Link to comment Share on other sites More sharing options...
janetjanet998 Posted March 15, 2011 Share Posted March 15, 2011 Wow-- that is really, really shallow. The shaking at the surface must have been crazy. likley not that shallow , That happens often when they first pop up on that map ..... they will correct the depth later on... Link to comment Share on other sites More sharing options...
janetjanet998 Posted March 15, 2011 Share Posted March 15, 2011 Looks like there were two 6+ aftershocks at about the same time: http://earthquake.us...0023fx.php#maps http://earthquake.us...001xka.php#maps One east and one west of Tokyo? Really? they are 4 hours apart Link to comment Share on other sites More sharing options...
HurricaneJosh Posted March 15, 2011 Share Posted March 15, 2011 For whatever reason, it's "only" estimated to have a maximum shaking intensity of around VII: http://earthquake.usgs.gov/earthquakes/pager/events/us/c00023fx/exposure_small.png Maybe the fact that it was centered in a mountainous area? Or maybe it's a kind of fault that doesn't produce as strong surface waves. Yeah, mountainous areas will generally shake a lot less than flat areas. Or, maybe like janetjanet said, the initial depth estimate is way off. Or... maybe they don't have all the reports in yet. The MM values rely heavily on actual observations, I believe. Link to comment Share on other sites More sharing options...
Mallow Posted March 15, 2011 Share Posted March 15, 2011 theye are 7 hours apart Hrm. That 6.3 showed up as "red" when I first clicked on it (<1 hr old). But yes, you're right. Looks like the 6.1 west of Tokyo is the only new one. Link to comment Share on other sites More sharing options...
SuperNET Posted March 15, 2011 Share Posted March 15, 2011 1435: Following earlier reports, it appears there has been more than one strong aftershock in Japan - AP reports two tremors measuring over 6.0 within three minutes of each other. Link to comment Share on other sites More sharing options...
janetjanet998 Posted March 15, 2011 Share Posted March 15, 2011 Hrm. That 6.3 showed up as "red" when I first clicked on it (<1 hr old). But yes, you're right. Looks like the 6.1 west of Tokyo is the only new one. I don;t think that site is updating that fast..i noticed that yesterday...sometimes 90 minutes would go by without a quake showing up then a bunch of missing old quakes later on in that time frame would show up 1435: Following earlier reports, it appears there has been more than one strong aftershock in Japan - AP reports two tremors measuring over 6.0 within three minutes of each other. Link to comment Share on other sites More sharing options...
Dunkman Posted March 15, 2011 Share Posted March 15, 2011 Yeah USGS is saying the first one was a 5.8, but if the 1km depth verifies it certainly felt stronger I'm sure. Link to comment Share on other sites More sharing options...
Mallow Posted March 15, 2011 Share Posted March 15, 2011 For reference, here's the Japan-area map: http://earthquake.usgs.gov/earthquakes/recenteqsww/Maps/10/140_35.php Link to comment Share on other sites More sharing options...
Dunkman Posted March 15, 2011 Share Posted March 15, 2011 Kyodo: BREAKING NEWS: Magnitude of Shizuoka quake revised upward to 6.4 from 6.0 USGS has not revised upwards yet that I've seen. Link to comment Share on other sites More sharing options...
janetjanet998 Posted March 15, 2011 Share Posted March 15, 2011 1507: A spokesman for Japan's meteorological agency says he does not know if there is a link between the strong earthquakes on Tuesday - including one of 6.0 magnitude - and Friday's massive 9.0-magnitude tremor. He says the epicentres were quite far apart. Link to comment Share on other sites More sharing options...
janetjanet998 Posted March 15, 2011 Share Posted March 15, 2011 yet another 6,0 aftershock this time on the north edge Magnitude6.0Date-Time Tuesday, March 15, 2011 at 15:23:53 UTC Link to comment Share on other sites More sharing options...
johnc Posted March 15, 2011 Share Posted March 15, 2011 So if I understand it, this 6.4 happened in an area where they've been expecting a large earthquake for some time. The JMA said today's earthquake is not the one they've been waiting for. Is it possible this earthquake released some strain however? Link to comment Share on other sites More sharing options...
johnc Posted March 15, 2011 Share Posted March 15, 2011 It's absolutely horrible seeing these stories about people looking for relatives or learning about their families. Link to comment Share on other sites More sharing options...
Mallow Posted March 15, 2011 Share Posted March 15, 2011 So if I understand it, this 6.4 happened in an area where they've been expecting a large earthquake for some time. The JMA said today's earthquake is not the one they've been waiting for. Is it possible this earthquake released some strain however? If they were expecting one along that fault, it's quite possible that the stress changes due to the larger earthquake helped to trigger this one. And yes, it would certainly release some of the stress on the fault. I don't know how much had built up before this 'quake, but if it was enough for a 7.0 (just for example), then a 6.1 would release something like ~10% of that stress. Link to comment Share on other sites More sharing options...
Derecho! Posted March 15, 2011 Share Posted March 15, 2011 If they were expecting one along that fault, it's quite possible that the stress changes due to the larger earthquake helped to trigger this one. And yes, it would certainly release some of the stress on the fault. I don't know how much had built up before this 'quake, but if it was enough for a 7.0 (just for example), then a 6.1 would release something like ~10% of that stress. Eh, it's a little over 30 times the ENERGY for each magnitude, so it only released a bit more than 1/30th of the stress of a 7.0. Link to comment Share on other sites More sharing options...
Mallow Posted March 15, 2011 Share Posted March 15, 2011 Eh, it's a little over 30 times the ENERGY for each magnitude, so it only released a bit more than 1/30th of the stress of a 7.0. That's right, sorry... I was thinking 10x. Link to comment Share on other sites More sharing options...
Ginx snewx Posted March 15, 2011 Share Posted March 15, 2011 CNN keeps referring to the video that was posted on FB three days ago by an American who lives in Japan as being taken by him, in fact it was taken by a Japanese photojournalist. They misstatements these networks keep repeating are appalling, hard to trust anything they say at all. Link to comment Share on other sites More sharing options...
ThePhotoGuy Posted March 15, 2011 Share Posted March 15, 2011 1958: Tsunamis on the scale that hit north-east Japan on Friday may strike the region about once every 1,000 years, a leading seismologist has said. Dr Roger Musson, the head of seismic hazard at the British Geological Survey (BGS), said there were similarities between the last week's event and another giant wave that hit the Sendai coast in 869AD. BBC http://www.bbc.co.uk/news/world-middle-east-12307698 Link to comment Share on other sites More sharing options...
ThePhotoGuy Posted March 15, 2011 Share Posted March 15, 2011 [4:13 p.m. ET Tuesday, 5:13 a.m. Wednesday in Tokyo] The governor of Tokyo has apologized for saying the earthquake and tsunami were God's punishment for Japanese egoism, the country's official news service reported. "I will take back (the remark) and offer a deep apology," Tokyo Gov. Shintaro Ishihara said at a news conference, according to Japan's official Kyodo News. On Monday, Ishihara had told reporters, "I think (the disaster) is tembatsu (divine punishment), although I feel sorry for disaster victims," according to Kyodo News. CNN http://news.blogs.cnn.com/2011/03/15/japan-quake-live-blog-fire-erupts-in-fourth-reactor-radiation-warning-issued/?hpt=T1 Link to comment Share on other sites More sharing options...
johnc Posted March 15, 2011 Share Posted March 15, 2011 I wonder what he means by "egoism". Link to comment Share on other sites More sharing options...
ThePhotoGuy Posted March 15, 2011 Share Posted March 15, 2011 [4:39 p.m. ET Tuesday, 5:39 a.m. Wednesday in Tokyo] The official number of missing people in Japan has risen to 7,558, and 1,990 have been reported injured. The death toll remains at 3,373 but is expected to rise as rescuers reach more hard-hit areas. http://news.blogs.cnn.com/2011/03/15/japan-quake-live-blog-fire-erupts-in-fourth-reactor-radiation-warning-issued/?hpt=T1 Link to comment Share on other sites More sharing options...
aslkahuna Posted March 15, 2011 Share Posted March 15, 2011 1958: Tsunamis on the scale that hit north-east Japan on Friday may strike the region about once every 1,000 years, a leading seismologist has said. Dr Roger Musson, the head of seismic hazard at the British Geological Survey (BGS), said there were similarities between the last week's event and another giant wave that hit the Sendai coast in 869AD. BBC http://www.bbc.co.uk...e-east-12307698 Uh, Taro in the Sanriku district was hit by a 30 meter high tsunami in 1896 and a 10 meter one in 1933. They are referred to as the Great Meji and Great Showa tsunamis respectively. Steve Link to comment Share on other sites More sharing options...
09-10 analogy Posted March 15, 2011 Share Posted March 15, 2011 All the focus on the nuclear issue tends to obscure the ongoing tragedy; people are still dying from the affects of the tsunami. From the BBC: 2208: Lyn Francis, in the UK, told the BBC she received a text message from a friend who is trapped by floods on the fifth floor of a university building in Ishinomaki. "He and his colleagues have very little - or by now possibly no - food, no water and no heating. I received a text from him at 2100 GMT it read: 'It's bad. Love to you all'. It sounds like the last text someone would write if they were dying." Eerily reminiscent of the voicemails from the North Tower. Link to comment Share on other sites More sharing options...
Derecho! Posted March 15, 2011 Share Posted March 15, 2011 Uh, Taro in the Sanriku district was hit by a 30 meter high tsunami in 1896 and a 10 meter one in 1933. They are referred to as the Great Meji and Great Showa tsunamis respectively. Steve Those quakes weren't quite as big as this one, and ruptured a portion a bit north of this quake. Link to comment Share on other sites More sharing options...
earthlight Posted March 16, 2011 Share Posted March 16, 2011 Go to 4:10 http://www.youtube.com/watch?v=hAE7GLE_cOc&feature=player_embedded Link to comment Share on other sites More sharing options...
k*** Posted March 16, 2011 Share Posted March 16, 2011 Go to 4:10 http://www.youtube.c...player_embedded now that is a tsunami...holy cow Link to comment Share on other sites More sharing options...
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