Dari: agung hertanto <agungeka@yahoo.
Teman Temin,
Team Geologist dari seluruh dunia mengamati Indonesia
setelah kejadian gempa kemarin. Mereka mengatakan
ada kemungkinan terjadi Super Gempa (Maha Gempa)
dalam masa dekat ini. Masa dekat menurut skala
Geologist (tolong saya dikoreksi) berarti kurang
dari 20 tahun. Bukti bukti ke arah itu ada.
Kalau Maha Gempa (minimal, sekali lagi minimal
seperti di Aceh) terjadi di Jawa Barat atau
Lampung ... ampun dah dengan Jakarta. Pemerintahan
collapse, chaos dimana-mana.
Berikut beritanya dari CNN 18 September kemarin.
salam
------------
HUDOYO:
Bagaimana kalau terjadi gempa skala Richter 9 di Jakarta?
Teman-teman yang tinggal di apartemen bertingkat mungkin harus pikir-pikir lebih lanjut; gempa skala Richter 9 mengakibatkan: "Overhead highways may be destroyed, and buildings are toppled." (Wikipedia)
Di bawah ini tercantum skala Richter menurut Wikipedia. Gempa di barat Bengkulu sudah tercantum di sana.
Lihat foto San Francisco yang hancur sehabis gempa skala Richter pada tahun 1906:
http://upload.
Salam,.
Hudoyo
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INDONESIA'S BIG ONE "ON ITS WAY"
By Hugh Riminton, CNN
PADANG, Indonesia, Sept 18 (CNN) -- An international team of earthquake specialists says Indonesia faces another potential "giant" quake in the near future.
The scientists, including a team from the California Institute of Technology, says three major quakes in the last week have increased the likelihood of a major disaster.
CNN traveled to the earthquake zone with a scientist who deliberately puts himself in the path of the world's most powerful quakes.
Smack on the equator, Indonesia's Sumatra island holds the deadliest stretch of ocean in the world.
"You'd see a strip 30 meters high, stripped down to bedrock," says John Galetzka, a former U.S. Army ranger who is now adventuring on another frontline as an earthquake geologist. He is investigating the fault line that sparked the 2004 tsunami and, in recent days, three more powerful quakes.
Last Friday, Galetzka shot video footage of the shaking beach, with startled locals scrambling upshore.
His thoughts turned immediately to the tsunami danger, and his command ship offshore. Just moments later he caught the panic near the beach, as he saw families evacuating to the hills about 200 meters behind their village.
The day before, another big quake struck -- larger, but further away. Galetzka recalls the long slow waves and a shivering water bottle. For the American geologist, this is where theory meets reality.
"I just felt like the luckiest man alive to feel two strong events," he says. "You can almost hear the excitement in my voice -- oh my gosh, this is it, this is it ..."
Galetzka is now examining the evidence that his team believes indicates the arrival another giant earthquake, and possible tsunami.
He has established a network of position-markers, linked by satellite, that show a constant creep, northeast, among the islands on Indonesia's Indian Ocean frontier. The first one was placed in August 2002.
The 30 measuring stations along Sumatra's western coast tell an ominous tale. Driven by the plate beneath the Indian Ocean, the entire coastline is flexing, as the earth literally bends. The pressures are already enormous, and at some point probably soon, they will become intolerable.
The implications are terrifying.
"Eventually it has got to release in (the form) of giant earthquake," states Galetzka matter-of-factly.
It could be a rare magnitude-9 quake, and with the plates so tightly sprung, it will happen sooner, he believes, rather than later.
Knowing what he knows, does he worry about the people living along this coast?
"I absolutely do," he replies. "I tell them to be prepared. Whenever I am in Padang I think about my escape routes, almost every moment."
As he criss-crosses around the islands, searching for data, Galetzka says his aim is to save lives. But he, more than anyone, knows the risks -- that one day he'll confront a giant wave, a tsunami powerful enough to swallow islands.
The geologist's voice quivers as he imagines "the big one."
"If we saw it, we'd just head right into it. I'd shake your hand and say, good luck!" ***
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Richter scale
(From Simple English Wikipedia - the free encyclopedia that anyone can change)
The Richter magnitude scale is a scale of numbers used to tell the size of Californian <http://simple.
Earthquakes that are 4.5 or higher on the Richter scale can be measured by tools all over the <http://simple.
The scale is <http://simple.
Descriptor //Richter Magnitude number //Damage caused by the earthquake //Frequency of occurence //Example:
* Micro //Less than 2.0 //Micro (very small) earthquakes, people cannot feel these. //About 8,000 each day //0.5 - Large hand grenade, 1.0 Construction site blast, 1.5 - WWII conventional bomb;
* Very minor //2.0-2.9 //People do not feel these, but seismographs are able to detect them. //About 1,000 per day // 2.0 - late WWII conventional bomb, 2.5 - WWII blockbuster bomb;
* Minor //3.0-3.9 //People often feel these, but they rarely cause damage. //About 49,000 each year //3.0 - Massive Ordnance Blast bomb, 3.5 - Chernobyl nuclear disaster (1986);
* Light //4.0-4.9 //Objects inside houses are disturbed, causing noise. Nothing is damaged. //About 6,200 each year //4.0 - Small atomic bomb;
* Moderate //5.0-5.9 //Buildings that are not built well may be damaged. Light objects inside a house may be moved. //About 800 per year //5.0 - Nagasaki atomic bomb (actual seismic yield was negligible since it detonated in the atmosphere), 5.5 - Little Skull Mtn, NV earthquake (1992);
* Strong //6.0-6.9 //Moderately powerful. May cause a lot of damage in a larger area. //About 120 per year //6.0 - Double Spring Flat, NV earthquake (1994), 6.5 - Northridge earthquake (1994);
* Major //7.0-7.9 //Can damage things seriously over larger areas. //About 18 per year //7.0 - Tsar Bomba, largest thermonuclear weapon ever tested (magnitude seen on seismographs reduced because it detonated 4 km in the atmosphere), 7.5 - Tangshan earthquake (1976);
* Great //8.0-9.9 //Massive damage is caused. Heavy objects are thrown into the air and cracks appear on the ground, as well as visible shockwaves. Overhead highways may be destroyed, and buildings are toppled. //About 1 per year //8.0 - San Francisco, CA earthquake (1906), earthquake near Chincha Alta, Peru (August 2007), earthquake near Indonesia (September 12th, 2007), 9.0 - Anchorage, AK earthquake (1964), 9.3 Indian Ocean earthquake (2004);
* Meteoric //10.0+ //There are no records of anything of this size. The vibration is about the same as that of a 20km meteor. //Unknown, 10.0 - estimate for a 2 km rocky meteorite impacting at 25 km/s, 12.0 - fault earth in half through center, earth daily receipt of solar energy..
(Adapted from U.S. Geological Survey documents.)
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