Well, to be clear, if it has erupted in at any point in recorded human history, it is an active volcano.
Printable View
Right. I'm agreeing with you. lol
What I DID NOT agree with was your "definition". And I still don't agree.
(You said a 'dormant volcano' is active... however you worded it wasn't worded right, and I was laughing about the way you worded it! :))
Oh, here it is.. hehe
Obviously if it has been "dormant" it isn't active. If it is active, it isn't dormant. That's allQuote:
A volcano that has been dormant for 100 years is not dormant, it is considered active.
What's the air speed velocity of a sparrow carrying a coconut?
African? Or European?
Swarm Of Quakes Rattle California, Arizona: USGS
August 26, 2012
A series of earthquakes measuring up to 5.4 rattled southern California, Arizona and the Mexican border region Sunday, seismologists said, although no damage or injuries were immediately reported.
The small- and medium-level quakes were felt from San Diego and Orange County in California east into Arizona, and swamped the temblor-measuring resources of the US Geological Survey (USGS).
The quakes began around 12:16 pm (2016 GMT) with a magnitude 4 temblor 16 miles (26 km) north of El Centro, California, and lasted more than two hours. The biggest shakes included a magnitude 5.4 at 13:57, with the same epicenter.
The so-called "seismic swarm" is a relatively rare occurrence.
"We haven't seen one of these since the 1970s, and there was another one back in the 1930s," said USGS seismologist Lucy Jones.
"Our system is choking on so many earthquakes."
Buildings were evacuated in Brawley, 115 miles east-northeast of San Diego. "It's pretty bad, we had to evacuate the hotel just for safety," said Rowena Rapoza, office manager at the Best Western Hotel there.
Yellowstone is next....
/grin
Big quake off the coast of Philippines. Wonder if the "swarm" a few days ago was a sign of things to come? There were apparently several hundred small tremors in California the other day. Maybe they were a portend to this?
Quake of 7.9 magnitude strikes off Philippines: USGS
MANILA | Fri Aug 31, 2012 9:46am EDT
(Reuters) - An earthquake of 7.9 magnitude struck off the Philippines on Friday and a tsunami warning has been issued for the region, the U.S. Geological Survey and the Pacific Tsunami Warning Center said.
The quake was centered off the east coast, 91 miles off the town of Guiuan in Samar province at a depth of about 20 miles, USGS said.
The tsunami warning was issued for the Philippines, Japan, Indonesia, Taiwan, Papua New Guinea and other islands in the Pacific including the U.S. state of Hawaii.
The NOAA Tsunami Center later lifted a warning for Japan, Taiwan and several other Pacific islands.
"Strong earthquake here in Taft, Eastern Samar! And it lasted very long too!" Samar congressman, Ben Evardone, told reporters via text message.
An official at the Philippines' Volcanolgy Institute said he expected damage had been caused in Samar province but he had yet to receive any reports.
"If you are anywhere near the coast I recommend that you head to higher ground," Paul Caruso of the USGS told Sky TV by telephone when asked about a threat of a tsunami hitting the coast of the Philippines.
31 August 2012 Last updated at 09:47 ET
Tsunami alert after earthquake off Philippines
http://news.bbcimg.co.uk/media/image...66ddd94f78.jpg
A tsunami warning has been issued for the Philippines, Indonesia and Palau after a 7.9-magnitude earthquake offshore.
The quake had a depth of 33km (20 miles) and struck at 20:47 local time (12:47 GMT), the US Geological Survey said. It was located off the Philippines island of Samar.
There are no details of any damage or casualties from the quake.
It is not yet known if a tsunami has actually been generated.
Warnings were also initially issued for Taiwan, Japan, Papua New Guinea, Guam, the Northern Mariana Islands and Yap, but were later lifted.
7.9 Mwp - PHILIPPINE ISLANDS REGION
For updates, maps, and technical information, see:
Preliminary Earthquake Report Magnitude 7.9 Mwp Date-Time · 31 Aug 2012 12:47:34 UTC
· 31 Aug 2012 20:47:34 near epicenter
· 31 Aug 2012 05:47:34 standard time in your timezoneLocation 10.828N 126.677E Depth 34 km Distances · 106 km (66 miles) ESE (102 degrees) of Guiuan, Samar, Philippines
· 175 km (109 miles) NE (48 degrees) of Surigao, Mindanao, Philippines
· 187 km (116 miles) ESE (104 degrees) of Tacloban, Leyte, Philippines
· 749 km (465 miles) SE (124 degrees) of MANILA, PhilippinesLocation Uncertainty Horizontal: 13.7 km; Vertical 5.8 km Parameters Nph = 486; Dmin = 432.9 km; Rmss = 1.00 seconds; Gp = 13°
M-type = Mwp; Version = 9Event ID us c000cc5m
Event Page
or
USGS Earthquake Hazards Program
National Earthquake Information Center
U.S. Geological Survey
http://neic.usgs.gov/
I believe, in my most unscientific way, that the earth releases stress in a systematic way. So, when earthquakes occur, they occur in patterns until the energy within has been dispersed. The waves generated by the earthquake must travel in and through the crust, mantle and core of the earth until they reach the opposite point on the sphere. Then reflection would happen. Other related quakes.
Then again, what the hell do I know? Geology 101.
You're pretty much right. I had never heard of swarms before a few years ago and then I saw a graphic map that showed years and years of data on quakes that had been plotted in a moving fashion. When a set of quakes happened a few weeks, months or even a couple of years later, another group would occur.
While the map was showing Russia and Asia you could see a CLEAR progression of the quakes moving a little at a time across the whole of the continents going east to west.
In the US, I'm betting the same thing could be shown going west to east.
Everything moving from "the Ring of Fire".
The California swarm is east of the ring of fire. The Philippines are directly in it. To me this indicates something BIG happening in the Pacific right now and moving away from the "center" (where ever that is).
Quake Off The Philippines Triggers Tsunami Alert
http://a.abcnews.com/images/Internat..._120831_wg.jpg A 7.9-magnitude undersea quake struck off the eastern coast of the Philippines late Friday, triggering tsunami warnings across a wide swath of Asia. (AP)
By AKIKO FUJITA (@akikofujita)
Aug. 31, 2012
A powerful earthquake struck off the eastern coast of the Philippines Friday, knocking out power to several cities, and triggering tsunami alerts all along the active Pacific "Ring of Fire."
The magnitude 7.6 quake hit roughly 66 miles east of Samar Island, and had a depth of 20 miles, according to the USGS.
Tsunami alerts were issued in seven countries including the Philippines, Indonesia, and Japan. Most were lifted shortly after, but along the eastern coast of Japan, still rebuilding from a devastating tsunami last March, residents were told to seek higher ground as a precaution, according to broadcaster NHK.
The Japan Meteorological Agency forecast small waves to hit the coast of Japan late Friday night.
In the southern Cagayan de Oro city in the Philippines, local media reported one house collapsed, while power outages were reported in several other towns and cities across central and southern Philippines.
Three earthquakes hit Philippines
No casualties or damage to property were reported
- By Barbara Mae Dacanay, Bureau Chief
- Published: 14:05 August 27, 2012
Manila: Three earthquakes measuring 6.6, 3.3, and 4.5 on the Richter scale, hit southern and northern Luzon, on Sunday and Monday, respectively, the Philippine Institute of Volcanology and Seismology (Phivolcs) said. No casualties or damage to property were reported.
A temblor measuring 4.5 on the Richter scale hit 18 kilometres southeast of Laoag City, in northern Philippines, at 12.28om on Monday, Phivolcs said.
A weaker earthquake measuring 3.3 occurred 8 kilometres southeast of Cateel, Davao Oriental, in the southern Philippines at 5.48am on Monday, Phivolcs said.
A strong earthquake measuring 6.6 hit the south earliest, 390 kilometres southeast of Sarangani, Davao del Sur, at 11.05pm on Sunday, Phivolcs added.
The strong quake was of Intensity 4 in Davao City; Intensity 3 in General Santos City, and Intensity 2 in Koronadal City, Tupi, and Polomolok town in south Cotabato province.
The Philippines is part of Asia Pacific’s Ring of Fire where earthquakes and typhoons occur often.
Here's what I was talking about. Check this map out. Look where the ring of fire is located:
http://pubs.usgs.gov/gip/dynamic/graphics/Fig22.gif
Here's a little different map:
http://upload.wikimedia.org/wikipedi...f_Fire.svg.png
And this one is actually better, it shows the plates of the planet.
http://upload.wikimedia.org/wikipedi...ct2_en.svg.png
What are you driving at here?
An Earthquake in the Philippines is about as uncommon as Oxygen.
Just trying to track the swarms that happened the other day in California in association with what happened today in Phillippines.
Several hundred small quakes along that line in California might have been used in a predictive fashion.
Then a big quake off the Philippines hits... (under water of course).
Nothing concrete, just the fact we had a bunch on one side of the ring, then a big one on the other side. Its definite evidence that one set of quakes might be used as a predictive tool.
The Pacific plate is moving North West and pretty much sliding across the North American plate, as well as pushing against the Philippines plate/trench.
So, I'm just saying that it moved enough to cause quakes on opposite sides of the Pacific Plate at the same time (roughly and geologically speaking anyway).
The reason (I think) we saw the swarms the other day was the plate sliding along and getting "unstuck" for a time causing tremors. If scientists were thinking it over and doing measurements at the time (which they are, I'm sure) they might have been able to use that information to predict a large quake off Philippines in the next few days.
Which they didn't. (And probably never will because if they are wrong they look like idiots, if they are right they cause panic, LOL)