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Diego Garcia
The female operator in answer to a query from an aircraft after giving weather
information reported no ill effects from the earthquake. So everything appears well on Diego Garcia. 1653 on 13254 USB dxAce Michigan USA |
dxAce wrote:
The female operator in answer to a query from an aircraft after giving weather information reported no ill effects from the earthquake. So everything appears well on Diego Garcia. They got lucky. DG is an atoll (for those who don't know what that is, look it up), a 30 foot high wave could easily wipe it off the face of the earth. 1653 on 13254 USB dxAce Michigan USA |
I talked by phone, about an hour ago, with a gentleman on DG and he
said they experienced waves 3 to 4 feet high but suffered no damage. If the island's elevation is only 4 to 22 feet high, that makes sense. But why was there so much damage to the coast of Somalia, another 2000 miles further west, and no damage to DG?? Would they tell us if there really was damage on DG?? |
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In article , dxAce wrote:
wrote: I talked by phone, about an hour ago, with a gentleman on DG and he said they experienced waves 3 to 4 feet high but suffered no damage. If the island's elevation is only 4 to 22 feet high, that makes sense. But why was there so much damage to the coast of Somalia, another 2000 miles further west, and no damage to DG?? Would they tell us if there really was damage on DG?? Nah, it's all a big secret to get you conspiracy kooks going! But actually it probably has a lot to do with the mechanics of the wave itself and the sea floor/bed around Diego Garcia itself. The wave may have 'flowed' around Diego Garcia, but when it reached Somalia it had nowhere else to go but up the beach. It's pretty simple physics. Yes, I dug out the Nat. Geo. World Atlas and the physical map of the Indian Ocean shows why some areas like India and Somalia got plastered. The continental shelf and the shoreline are parallel to the wave front, so the energy got concentrated vertically. Diego Garcia and the Chagos have the Chagos Trench that runs east and south of DG, so the energy could diffract around. The surprise for me is that Broome and Northwest Australia didn't get it hard. One description (can't remember if it was in the newspaper or on one of the American TV news broadcasts) said that in these subduction quakes, some of the seabed falls and some areas rise. So there's a dipole effect where, for some directions, the waves cancel out. They said Sumatra moved 100 ft. I'd hate to be a land surveyor there using GPS. Until they recalibrate their local benchmarks, it'll be hopeless. Mark Zenier Washington State resident |
dxAce wrote: wrote: I talked by phone, about an hour ago, with a gentleman on DG and he said they experienced waves 3 to 4 feet high but suffered no damage. If the island's elevation is only 4 to 22 feet high, that makes sense. But why was there so much damage to the coast of Somalia, another 2000 miles further west, and no damage to DG?? Would they tell us if there really was damage on DG?? Nah, it's all a big secret to get you conspiracy kooks going! But actually it probably has a lot to do with the mechanics of the wave itself and the sea floor/bed around Diego Garcia itself. The wave may have 'flowed' around Diego Garcia, but when it reached Somalia it had nowhere else to go but up the beach. It's pretty simple physics. dxAce Michigan USA It all has to do with something called "run-up".........basically, it's how far the water travels inland which is determined by the sea floor. USGS has an online walk through on the mechanics of the tsunami. I am a survivor of the great Alaskan earthquake and subsequent tsunamis in 1964. Did you know that since the initial temblor (off the coast of Sumatra) there have been a total of 46 exceeding 5.0......and that there now are indications that a wave was generated as well that entered the pacific. Interesting stuff here. |
Dionne wrote: dxAce wrote: wrote: I talked by phone, about an hour ago, with a gentleman on DG and he said they experienced waves 3 to 4 feet high but suffered no damage. If the island's elevation is only 4 to 22 feet high, that makes sense. But why was there so much damage to the coast of Somalia, another 2000 miles further west, and no damage to DG?? Would they tell us if there really was damage on DG?? Nah, it's all a big secret to get you conspiracy kooks going! But actually it probably has a lot to do with the mechanics of the wave itself and the sea floor/bed around Diego Garcia itself. The wave may have 'flowed' around Diego Garcia, but when it reached Somalia it had nowhere else to go but up the beach. It's pretty simple physics. dxAce Michigan USA It all has to do with something called "run-up".........basically, it's how far the water travels inland which is determined by the sea floor. USGS has an online walk through on the mechanics of the tsunami. I am a survivor of the great Alaskan earthquake and subsequent tsunamis in 1964. Did you know that since the initial temblor (off the coast of Sumatra) there have been a total of 46 exceeding 5.0......and that there now are indications that a wave was generated as well that entered the pacific. Interesting stuff here. Yes, there have been a lot of aftershocks. I subscribe to the the service he http://earthquake.usgs.gov/products/..._services.html Which notifies me of earthquakes exceeding 5.5 anywhere in the world or 4.5 in the USA. dxAce Michigan USA |
Thanx for the link. Didn't know that was hiding in there!
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Hi!
I just found this info on the status of Diego Garcia. I was stationed there for a year (1979-1980) as a member of the US Navy. I was happily suprised to learn that the island was spared...having spent many hours roaming the shores of "DG", I know how easily it could be overrun by a tsunami...don't recall a place as HIGH as 22 feet...The highest spot I was on was the at the base SWIMMING POOL! It was elevated so that when you stood at poolside, you were at about room height of surrounding buildings. I was a lifeguard in my "spare" time. We were standing port/starboard (12 on 12 off) work schedules at the Naval Security Group Activity there. I still managed to hold down a part time job! I was there when we did the failed Iranian Embassy Rescue Mission. Some of the C-130 crews met at the pool to talk about the "mission"...no one...even THEM knew exactly where they were going or why! It was very hush hush. I am also a ham radio operator (WA1JMM) and although I didn't get to operate while there, I did get a British Indian Ocean Territory call sign from the British Government...think it was "VP9GD" or GRD...they used your initials for the call letters! Got to make one phone patch at the Navy MARS station and then discovered the Autovon phone system...got to talk to my wife via an very understanding phone op in Maine! Ah the fond memories of "The Rock"! George, Senior Chief Petty Officer, USN (Retired). |
George wrote: Hi! I just found this info on the status of Diego Garcia. I was stationed there for a year (1979-1980) as a member of the US Navy. I was happily suprised to learn that the island was spared...having spent many hours roaming the shores of "DG", I know how easily it could be overrun by a tsunami...don't recall a place as HIGH as 22 feet...The highest spot I was on was the at the base SWIMMING POOL! It was elevated so that when you stood at poolside, you were at about room height of surrounding buildings. I was a lifeguard in my "spare" time. We were standing port/starboard (12 on 12 off) work schedules at the Naval Security Group Activity there. I still managed to hold down a part time job! I was there when we did the failed Iranian Embassy Rescue Mission. Some of the C-130 crews met at the pool to talk about the "mission"...no one...even THEM knew exactly where they were going or why! It was very hush hush. I am also a ham radio operator (WA1JMM) and although I didn't get to operate while there, I did get a British Indian Ocean Territory call sign from the British Government...think it was "VP9GD" or GRD...they used your initials for the call letters! Got to make one phone patch at the Navy MARS station and then discovered the Autovon phone system...got to talk to my wife via an very understanding phone op in Maine! Ah the fond memories of "The Rock"! George, Senior Chief Petty Officer, USN (Retired). http://www.members.tripod.com/carlvillanueva/id22.htm dxAce Michigan USA |
But actually it probably has a lot to do with the mechanics of the wave
itself and the sea floor/bed around Diego Garcia itself. The wave may have 'flowed' around Diego Garcia, but when it reached Somalia it had nowhere else to go but up the beach. I watched a simulation that showed the main "wave" energy was directed squarely towards Sri Lanka. Probably because it was paralell to the fault line near Indonesia. While watching the simulation I noted that DG was not in line and quite a bit outside (flanked) of this main wave energy. It's pretty simple physics. Fluid dynamics is excruciatingly complicated. |
tianli wrote: But actually it probably has a lot to do with the mechanics of the wave itself and the sea floor/bed around Diego Garcia itself. The wave may have 'flowed' around Diego Garcia, but when it reached Somalia it had nowhere else to go but up the beach. I watched a simulation that showed the main "wave" energy was directed squarely towards Sri Lanka. Probably because it was paralell to the fault line near Indonesia. While watching the simulation I noted that DG was not in line and quite a bit outside (flanked) of this main wave energy. It's pretty simple physics. Fluid dynamics is excruciatingly complicated. It's just to deep for me. dxAce Michigan USA |
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This is on GlobalSecurity.org:
http://www.globalsecurity.org/milita...ego-garcia.htm Initial indications are that Diego Garcia was not affected by the Andaman Tsunami of 26 December 2004. It is located south of the tip of India, well with in range of what the tsunami, with a max elevation of 22 and an average elevation of only 4 feet. Civilians monitoring shortwave radio reported on rec.radio.shortwave that a female operator, in answer to a query from an aircraft after giving weather information, reported no ill effects from the earthquake. Officials said the Diego Garcia Navy Support Facility, which houses about 1,700 military personnel and 1,500 civilian contractors, suffered no damage related to the earthquake and ensuing tsunamis. Personnel at the facility reported no unusual activity or problems over the weekend. Diego Garcia, the southernmost island in the Chagos Archipelago, sits about 1,000 miles south of India and roughly 2,000 miles from the earthquake's epicenter. Even though an earthquake like Sunday's will radiate destructive waves in all directions, the damage caused by the water differs greatly depending on the undersea topography. Favorable ocean topography minimized the tsunami's impact on the atoll. Diego Garcia is part of the Chagos Archipelago, situated on the southernmost part of the Chagos-Laccadive Ridge. To the east lies the Chagos Trench, a 400 mile long, underwater canyon that ranges in depth from less than 1,00 meters below the surface to depths that plunge to over 5,000 meters. It is one of the deepest regions of the Indian Ocean. Diego Garcia is located to the west of Chagos Trench, which runs north and south. The depth of the Chagos Trench and grade to the shores does not allow for tsunamis to build before passing the atoll. The result of the earthquake was seen as a tidal surge estimated at six feet. Mark Zenier wrote: In article , dxAce wrote: wrote: I talked by phone, about an hour ago, with a gentleman on DG and he said they experienced waves 3 to 4 feet high but suffered no damage. If the island's elevation is only 4 to 22 feet high, that makes sense. But why was there so much damage to the coast of Somalia, another 2000 miles further west, and no damage to DG?? Would they tell us if there really was damage on DG?? Nah, it's all a big secret to get you conspiracy kooks going! But actually it probably has a lot to do with the mechanics of the wave itself and the sea floor/bed around Diego Garcia itself. The wave may have 'flowed' around Diego Garcia, but when it reached Somalia it had nowhere else to go but up the beach. It's pretty simple physics. Yes, I dug out the Nat. Geo. World Atlas and the physical map of the Indian Ocean shows why some areas like India and Somalia got plastered. The continental shelf and the shoreline are parallel to the wave front, so the energy got concentrated vertically. Diego Garcia and the Chagos have the Chagos Trench that runs east and south of DG, so the energy could diffract around. The surprise for me is that Broome and Northwest Australia didn't get it hard. One description (can't remember if it was in the newspaper or on one of the American TV news broadcasts) said that in these subduction quakes, some of the seabed falls and some areas rise. So there's a dipole effect where, for some directions, the waves cancel out. They said Sumatra moved 100 ft. I'd hate to be a land surveyor there using GPS. Until they recalibrate their local benchmarks, it'll be hopeless. Mark Zenier Washington State resident |
CORRECTION TO PREVIOUS POST
This is on Deigo Garcia's official US Navy website: http://www.dg.navy.mil/ then select Tsunami News Update at left-middle of screen/page. Initial indications are that Diego Garcia was not affected by the Andaman Tsunami of 26 December 2004. It is located south of the tip of India, well with in range of what the tsunami, with a max elevation of 22 and an average elevation of only 4 feet. Civilians monitoring shortwave radio reported on rec.radio.shortwave that a female operator, in answer to a query from an aircraft after giving weather information, reported no ill effects from the earthquake. Officials said the Diego Garcia Navy Support Facility, which houses about 1,700 military personnel and 1,500 civilian contractors, suffered no damage related to the earthquake and ensuing tsunamis. Personnel at the facility reported no unusual activity or problems over the weekend. Diego Garcia, the southernmost island in the Chagos Archipelago, sits about 1,000 miles south of India and roughly 2,000 miles from the earthquake's epicenter. Even though an earthquake like Sunday's will radiate destructive waves in all directions, the damage caused by the water differs greatly depending on the undersea topography. Favorable ocean topography minimized the tsunami's impact on the atoll. Diego Garcia is part of the Chagos Archipelago, situated on the southernmost part of the Chagos-Laccadive Ridge. To the east lies the Chagos Trench, a 400 mile long, underwater canyon that ranges in depth from less than 1,00 meters below the surface to depths that plunge to over 5,000 meters. It is one of the deepest regions of the Indian Ocean. Diego Garcia is located to the west of Chagos Trench, which runs north and south. The depth of the Chagos Trench and grade to the shores does not allow for tsunamis to build before passing the atoll. The result of the earthquake was seen as a tidal surge estimated at six feet. |
CORRECTION TO PREVIOUS POST
This is on Deigo Garcia's official US Navy website: http://www.dg.navy.mil/ then select Tsunami News Update at left-middle of screen/page. Initial indications are that Diego Garcia was not affected by the Andaman Tsunami of 26 December 2004. It is located south of the tip of India, well with in range of what the tsunami, with a max elevation of 22 and an average elevation of only 4 feet. Civilians monitoring shortwave radio reported on rec.radio.shortwave that a female operator, in answer to a query from an aircraft after giving weather information, reported no ill effects from the earthquake. Officials said the Diego Garcia Navy Support Facility, which houses about 1,700 military personnel and 1,500 civilian contractors, suffered no damage related to the earthquake and ensuing tsunamis. Personnel at the facility reported no unusual activity or problems over the weekend. Diego Garcia, the southernmost island in the Chagos Archipelago, sits about 1,000 miles south of India and roughly 2,000 miles from the earthquake's epicenter. Even though an earthquake like Sunday's will radiate destructive waves in all directions, the damage caused by the water differs greatly depending on the undersea topography. Favorable ocean topography minimized the tsunami's impact on the atoll. Diego Garcia is part of the Chagos Archipelago, situated on the southernmost part of the Chagos-Laccadive Ridge. To the east lies the Chagos Trench, a 400 mile long, underwater canyon that ranges in depth from less than 1,00 meters below the surface to depths that plunge to over 5,000 meters. It is one of the deepest regions of the Indian Ocean. Diego Garcia is located to the west of Chagos Trench, which runs north and south. The depth of the Chagos Trench and grade to the shores does not allow for tsunamis to build before passing the atoll. The result of the earthquake was seen as a tidal surge estimated at six feet. |
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