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The year 1997 marked the one hundredth anniversary of the general deployment of standardized and calibrated seismographs. It started with nine seismograph stations in 1898 that were capable of detecting, locating and measuring earthquakes of magnitude 7.0 or larger (M 7.0) anywhere in the globe. As a result, major earthquakes have been monitored globally and continuously for more than 100 years. By 1931 there were 350 stations operating worldwide that were locating and measuring M 6.5 earthquakes globally. By the 1950s the system of seismographs could locate all M 6.0 events occurring globally.
Source: T. M. Tsapanos and P. W. Burton, "Seismic Hazard Evaluation for Specific Seismic Regions of the World," Tectonophysics 194 (1991): p. 154.
For global events, magnitudes are not routinely reported until the early 1960s. This means, for example, that the largest earthquake observed - the 1960 Chilean earthquake (Mw 9.5) - appears in this catalog without an associated magnitude.
Originally posted by asala
Im hearring word that its just about to be upgraded to about a 7.1
Via the china earthquake networks...
Will update if more comes up.
Originally posted by boondock-saint
one thing i noticed about these quakes in China
is that most times quakes happen along fault lines.
In this case I saw no fault lines in that area
and there were 3 lumped together in the space
of a few hrs.
Maybe I'm wrong
How can that be explained???
In 1931, there were about 350 stations operating in the world; today, there are more than 8,000 stations and the data now comes in rapidly from these stations by electronic mail, internet and satellite.
Chinese media say at least 67 people have died and others are trapped under rubble in Qinghai province after an earthquake said to be magnitude 6.9.
The quake struck at 0749 (2349 GMT) 380km (240 miles) south-south-east of the city of Golmud, at a depth of 10km, according to US Geological Survey data.
It appears that at least some of the deaths occurred in Qinghai's ethnic Tibetan town of Yushu.
The quake was followed by two tremors measuring 5.3 and 5.2.
"Soldiers have been dispatched to save the people buried in the collapsed houses," local official Huang Limin was quoted as saying by China's state news agency Xinhua.
The homes are built with thick walls and are strong, but if they collapsed they could hurt many people inside
"Certainly there have been people hurt," one resident told Reuters news agency.
"Rescuers are trying to pull them out. A lot of one-storey houses have collapsed. Taller buildings have held up, but there are big cracks in them."
People from the Yushu prefecture highway department were frantically trying to dig out colleagues trapped in a collapsed building, department official Ji Guodong told Reuters by telephone.
Zhuo De, an ethnic Tibetan resident of Yushu, who spoke by phone from the capital of Qinghai province, Xining, after contacting his family in Yushu, said dozens of people might have been hurt.
"The homes are built with thick walls and are strong, but if they collapsed they could hurt many people.
Originally posted by Missletow
First of all, I am glad there are no fatalities reported with this last quake.
Now, I really do feel the need to repeat something I've said in other earthquake threads on ATS. We have a 6.0 to 6.9 quake an average of once every 3 days. We are a third of the way through the year and at about a third of the global average. Right on target. Not more than usual. Dead on normalcy. Not slightly unusual. Totally normal. Get my meaning?
Originally posted by Wookiep
reply to post by lee anoma
Interesting! But..care to share why you think this?
“This is "The Day After Tomorrow" scenario that we're talking about,” O’Brien said after being confronted by Senator Inhofe on his climate reporting.