wpbr Posted December 4, 2005 Share Posted December 4, 2005 Does anyone know if it was an earthquake or an explosion that rocked Chang Kian area of Chang Mai at 4.35pm this afternoon (Sunday)? Link to comment Share on other sites More sharing options...
wimpy Posted December 4, 2005 Share Posted December 4, 2005 Whatever it was, my dog and I sure felt it in Nong Hoi district. Link to comment Share on other sites More sharing options...
Tywais Posted December 4, 2005 Share Posted December 4, 2005 (edited) I heard a rumbling sound about that time like a large lorry going by but don't have any roads with that kind of vehicle near me. I'm near Hang Dong. Edited December 4, 2005 by tywais Link to comment Share on other sites More sharing options...
MYMA Posted December 4, 2005 Share Posted December 4, 2005 We felt it too. We live off of Moon Muang. The whole house shook. Link to comment Share on other sites More sharing options...
wpbr Posted December 4, 2005 Author Share Posted December 4, 2005 Hmm. Must have been an earthquake then. Quite a bang preceeded the movement. Felt another smaller one at about 4.55pm too. Link to comment Share on other sites More sharing options...
JXXXL Posted December 4, 2005 Share Posted December 4, 2005 We felt it here in Hang Dong. It sure felt - and sounded - more like an explosion than a quake. I'm from California so I've felt a few quakes. Link to comment Share on other sites More sharing options...
Foggy Bottom Posted December 4, 2005 Share Posted December 4, 2005 Felt what appeared to be a strong tremor around quarter to 4, follwed by a very mild "aftershock" 8 minutes later Anyone else feel it? What's the link to that earthquake watch site? It didn't feel as if it was within Thailand (based on previous tremors I've felt here, but might have been in the Shan states. Gaz Link to comment Share on other sites More sharing options...
Foggy Bottom Posted December 4, 2005 Share Posted December 4, 2005 Aargh - that should read - around quarter to 5 (not quarter to 4) Link to comment Share on other sites More sharing options...
wimpy Posted December 4, 2005 Share Posted December 4, 2005 It was a sharp short jolt here. Didn't feel like a California style quake to me. Link to comment Share on other sites More sharing options...
chuchok Posted December 4, 2005 Share Posted December 4, 2005 Felt like a large truck went by 2" away from my window. Link to comment Share on other sites More sharing options...
sbk Posted December 4, 2005 Share Posted December 4, 2005 The USGS has a site : Recent earthquakes but it hasn't been updated for this afternoon yet, I think, only lists two in AK Link to comment Share on other sites More sharing options...
Maestro Posted December 4, 2005 Share Posted December 4, 2005 What's the link to that earthquake watch site? Looks like the quake you felt was not strong enough (≥ 4) to make it onto the list. Anything on the local news yet? Link to comment Share on other sites More sharing options...
think_too_mut Posted December 4, 2005 Share Posted December 4, 2005 The USGS has a site : Recent earthquakesbut it hasn't been updated for this afternoon yet, I think, only lists two in AK <{POST_SNAPBACK}> On September 16th, there was an eartquake in Tokyo that lasted for 7 minutes. Trapped in a high rise building, balancing to stay upright we watched other skyscrapers swaying. One minute through the quake, some people went to a website that already had the epicenter location and strenght. Thais should update their technology and procedures. Link to comment Share on other sites More sharing options...
chuchok Posted December 4, 2005 Share Posted December 4, 2005 The USGS has a site : Recent earthquakesbut it hasn't been updated for this afternoon yet, I think, only lists two in AK <{POST_SNAPBACK}> On September 16th, there was an eartquake in Tokyo that lasted for 7 minutes. Trapped in a high rise building, balancing to stay upright we watched other skyscrapers swaying. One minute through the quake, some people went to a website that already had the epicenter location and strenght. Thais should update their technology and procedures. <{POST_SNAPBACK}> It's not a Thai site. Link to comment Share on other sites More sharing options...
cmsally Posted December 4, 2005 Share Posted December 4, 2005 They felt it upstairs at our house but I was on ground level and didn't feel anything, that's pretty much the same with every earthquake. No "bang" here in central Chiang Mai. Link to comment Share on other sites More sharing options...
think_too_mut Posted December 4, 2005 Share Posted December 4, 2005 The USGS has a site : Recent earthquakesbut it hasn't been updated for this afternoon yet, I think, only lists two in AK <{POST_SNAPBACK}> On September 16th, there was an eartquake in Tokyo that lasted for 7 minutes. Trapped in a high rise building, balancing to stay upright we watched other skyscrapers swaying. One minute through the quake, some people went to a website that already had the epicenter location and strenght. Thais should update their technology and procedures. <{POST_SNAPBACK}> It's not a Thai site. <{POST_SNAPBACK}> Even worse - do they have one? Link to comment Share on other sites More sharing options...
sbk Posted December 4, 2005 Share Posted December 4, 2005 Topic has been merged with the one from General section. Link to comment Share on other sites More sharing options...
groo Posted December 4, 2005 Share Posted December 4, 2005 It felt weird. Just like a heavy truck passing by. Am right at the Superhighway. 100s of trucks pass by each day. Never felt anything. Could it be a bomb or something?? Link to comment Share on other sites More sharing options...
lopburi3 Posted December 4, 2005 Share Posted December 4, 2005 Thai TV has reported it as an earthquake of 4.? Link to comment Share on other sites More sharing options...
kerryk Posted December 4, 2005 Share Posted December 4, 2005 Does anyone know if it was an earthquake or an explosion that rocked Chang Kian area of Chang Mai at 4.35pm this afternoon (Sunday)? <{POST_SNAPBACK}> I am on the 4th story in an apartment by central dpt store and I sure felt it. Link to comment Share on other sites More sharing options...
Gulliver_in_LOS Posted December 4, 2005 Share Posted December 4, 2005 This is a simple exercise to estimate roughly the distance from the earthquake's epicenter and your position. It might be difficult for people with no previous experience with earthquakes. Could you estimate the time (in seconds or minutes) elapsed between the initial bang or horizontal movement and the start of the vertical movement of the earth? The shorter it is the closer you are to the epicenter, and vice versa. ---------------------------------- There are two waves generated from an earthquake: (1) Faster longitudinal compression P-waves, associated with the horizontal movement of the earth surface. (2) Slower transversal S-waves associated with vertical movement of the earth surface (and most destructive). Because of the difference in velocity between the two waves, by measuring the time span between the arrival of the p-wave, at the initial bang associated with compression, and the start of the vertical movement, associated with the arrival of the S-wave, the distance from the earthquake can be estimated. The closer you are to the epicenter the smaller this time is, and vice versa. ------------------------------ Link to comment Share on other sites More sharing options...
Dustoff Posted December 4, 2005 Share Posted December 4, 2005 ~ My guess was an explosion or some kind of surface impact. We are between Airport Plaza and Hang Dong, very close to the southern end of the runway and it jarred our house. Not a sonic boom because it didn't have that double ba-boom and it seemed way too short for an earthquake. Let us know if any of you find out, eh? Link to comment Share on other sites More sharing options...
wimpy Posted December 4, 2005 Share Posted December 4, 2005 This is a simple exercise to estimate roughly the distance from the earthquake's epicenter and your position. It might be difficult for people with no previous experience with earthquakes. Could you estimate the time (in seconds or minutes) elapsed between the initial bang or horizontal movement and the start of the vertical movement of the earth? The shorter it is the closer you are to the epicenter, and vice versa. ---------------------------------- There are two waves generated from an earthquake: (1) Faster longitudinal compression P-waves, associated with the horizontal movement of the earth surface. (2) Slower transversal S-waves associated with vertical movement of the earth surface (and most destructive). Because of the difference in velocity between the two waves, by measuring the time span between the arrival of the p-wave, at the initial bang associated with compression, and the start of the vertical movement, associated with the arrival of the S-wave, the distance from the earthquake can be estimated. The closer you are to the epicenter the smaller this time is, and vice versa. ------------------------------ <{POST_SNAPBACK}> For me it was a violent shaking that was over very quick. I would say it lasted about 1/2 second. Nothing more. Does that mean it was directly below me?? Link to comment Share on other sites More sharing options...
chuchok Posted December 4, 2005 Share Posted December 4, 2005 (edited) ~My guess was an explosion or some kind of surface impact. We are between Airport Plaza and Hang Dong, very close to the southern end of the runway and it jarred our house. Not a sonic boom because it didn't have that double ba-boom and it seemed way too short for an earthquake. Let us know if any of you find out, eh? <{POST_SNAPBACK}> It was an earthquake.See Lops post above.I live about 10 KM north of the city and felt and heard it.It was a rumble not an explosian. Edited December 4, 2005 by chuchok Link to comment Share on other sites More sharing options...
Gulliver_in_LOS Posted December 4, 2005 Share Posted December 4, 2005 ...I wasn't in Chiangmai during this earthquake. But the above exercise worked pretty well during my time in Japan, and could roughly estimate the distance from the epicenter, as very close, close, far, and very far, and always was correct! G Link to comment Share on other sites More sharing options...
Gulliver_in_LOS Posted December 4, 2005 Share Posted December 4, 2005 For me it was a violent shaking that was over very quick. I would say it lasted about 1/2 second. Nothing more. Does that mean it was directly below me?? <{POST_SNAPBACK}> If you could not distinguish clearly any time difference between the two movements, i.e. the horizontal first and then the vertical, yes, you were very close to the epicenter. G Link to comment Share on other sites More sharing options...
Gulliver_in_LOS Posted December 4, 2005 Share Posted December 4, 2005 (edited) This graph represents an earhtquake signal detected at three different locations. Note the time difference between the arrival of the P and S waves depending on the distance from the epicenter. From this one the distance from the epicenter can be calculated, if the time difference between the arrivals of the two waves is known. P Edited December 4, 2005 by Gulliver_in_LOS Link to comment Share on other sites More sharing options...
p1p Posted December 4, 2005 Share Posted December 4, 2005 Was out in the garden (near Hang Dong) when we felt the shake. The maid was bathing at the time and ran straight outside without grabbing a towel. Not a pretty sight! Link to comment Share on other sites More sharing options...
Gulliver_in_LOS Posted December 4, 2005 Share Posted December 4, 2005 Anybody felt the horizontal (forward and backward) shaking before the vertical (up and down)? If not, the epicenter was very close. However need more data to estimate the epicenter location within 30 Kms radius. G Link to comment Share on other sites More sharing options...
chuchok Posted December 4, 2005 Share Posted December 4, 2005 Was out in the garden (near Hang Dong) when we felt the shake. The maid was bathing at the time and ran straight outside without grabbing a towel. Not a pretty sight! <{POST_SNAPBACK}> That will teach you for letting your wife hire the maid p1p. Link to comment Share on other sites More sharing options...
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