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Oregon In Tsunami Danger/San Andreas Fault In Danger

In accordance with Title 17 U.S.C. Section 107, this material is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes. Willapa Magazine  has no affiliation whatsoever with the originator of this article.

 

Small earthquakes ‘swarm’ off the Oregon Coast
By Winston Ross

The [Eugene, OR]  Register-Guard

Published: April 12, 2008 12:00AM

NEWPORT — More than 600 earthquakes have rattled the central Oregon Coast in the past 10 days, too small and too distant to be felt onshore or cause damage, but anomalous enough to puzzle the scientists who recorded them.

It’s not uncommon for such earthquake “swarms” to occur along the Cascadia subduction zone — the spot where the San Juan de Fuca and North American plates interconnect. What’s strange about the recent spate of temblors is that they’re smack in the middle of the Juan de Fuca, in an area not typically known for a high degree of seismic activity.

“In the 17 years we’ve been monitoring the ocean through hydrophone recordings, we’ve never seen a swarm of earthquakes in an area such as this,” said Robert Dziak, a marine geologist with Oregon State University. “We’re not certain what it means.”

Three of the earthquakes have been at 5.0 magnitude or higher, another oddity. The largest was Monday, when a 5.4 temblor hit. Numerous small quakes have continued in between the periodic larger events.

Dziak said scientists hope to divert a ship to the site to take some water samples that may help them learn more. The water samples may indicate whether the earthquakes are the result of tectonic or hydrothermal processes, he said.

The quakes originated 150 nautical miles southwest of Newport, in a basin between two faults that rise out of deep “abyssal sediments.” An analysis of seismic “decay rates” — the increased intensity of quakes as they move outward from the source — suggests that these temblors aren’t a primary quake plus aftershocks, the scientists said.

“Some process going on down there is sustaining a high stress rate in the crust,” Dziak said.

Researchers hope to learn more about the quakes in the coming weeks as they monitor activity with hydrophones on the ocean floor.

The sensitive devices also have recorded a symphony of sounds revealing not only undersea earthquakes, but the movement of massive icebergs and vocalizations of several marine species.

The recent swarm is the eighth such swarm over the past dozen years, Dziak said, and the first seven probably were because of volcanic activity on the Juan de Fuca ridge.

“Usually, the plate moves at about the rate a fingernail might grow — say three centimeters a year,” he said. “But when these swarms take place, the movement may be more like a meter in a two-week period.”

The eighth swarm may be different, he said. “The fact that it’s taking place in the middle of the plate, and not a boundary, is puzzling,” he said. “It’s something worth keeping an eye on.”

In 2005, scientists recorded thousands of small quakes in a two-year period along the Juan de Fuca ridge northwest of Astoria, but they were located along the boundary of the tectonic plates, as expected.

Copyright 2007 — The Register-Guard, Eugene, Oregon, USA

 

 

02/10/08

Cantwell to advocate for Doppler Radar in Westport

The Seattle Times online

Seattle Times 2/10/2008

Wave of support building for new coastal weather radar

By Jack Broom

Seattle Times staff reporter


Fierce winter storms — hitting with particular severity the past two years — pack an undeniable punch in the Pacific Northwest, triggering floods, toppling trees, cutting electrical service, severing roads and highways.

But even though approaching storms are examined by satellite, radar, weather buoys and other equipment, a University of Washington scientist says a "blind spot" in the region's radar coverage prevents forecasters from getting the best possible look at weather headed our way.

Doppler radar on Camano Island 

Photo THOMAS JAMES HURST / THE SEATTLE TIMES

"It's pretty outrageous, really," said Cliff Mass, a UW professor of atmospheric sciences. "Significant systems come in, and we don't really have a good look at them."

Mass said utility managers, emergency crews and the general public are shortchanged by what he calls "the worst coastal weather-radar coverage in the continental U.S."

Mass, weather forecaster for KUOW's "Weekday" radio program, has campaigned for years for the addition of a Doppler radar station on the Washington coast and says the need has never been greater, nor has the potential benefit of the information it would generate.

The existing radar station on Camano Island, Mass says, is blocked by the Olympic Mountains from seeing the low-elevation portion of storms approaching the Washington coast. Those storms sometimes carry intense bands of rain.

Officially, the Weather Service has been cool toward the addition of a coastal radar station, questioning its need. But the idea is gaining political support: U.S. Sen. Maria Cantwell's staff members say she'll advocate a coastal radar in hearings next month of a subcommittee she chairs that reviews the budget of the Weather Service's parent agency, the National Oceanic and Atmospheric Administration (NOAA).

"We're actively trying to fix this problem," said Ciaran Clayton, spokeswoman for Cantwell. "The ability to predict within reason the severity of a storm, and let communities know what they're in for, is critically important."

Mass estimates the price of adding a radar station at Westport, Grays Harbor County, would be about $4.5 million — small compared with the toll exacted by major storms. Last December's storms, which killed several state residents, did damage that could top $1 billion, according to estimates from Gov. Christine Gregoire.

Mass said current forecasts of incoming storms rely too much on satellite images. "Satellites look down and see the storm from the outside," he said. "But to really know what's going on, you have to be able to look inside. It's like trying to diagnose a patient without the ability of an X-ray or MRI."

Information gathered by radar, coupled with new technology, could create detailed computerized models to predict the effects of a storm, Mass said.

Storms in December 2006 and December 2007 carried particularly heavy bands of rain. The Dec. 3, 2007, storm dropped more than 5 inches of rain in parts of Seattle, and even more in some other cities, taking local officials by surprise.

"Nobody saw that coming," said Nick Pealy, deputy director of field operations and maintenance for Seattle Public Utilities. "We don't have any good information that allows us to predict when rainstorms are coming, where they're going to hit or how much rainfall they're carrying."

The early notice a coastal radar might provide, Pealy said, could give the city a chance to warn residents in the path of a storm, position crews to check affected drains and deploy supplies and equipment, such as sandbags and pumps, to help cope with a deluge.

It's not clear if advance notice of heavy rains could have prevented the chain of circumstances, including the collapse of a retaining wall, that led to the December 2006 drowning death of Kate Fleming in the basement of her Madison Valley home. But Pealy said the utility is examining an "outdialer" system to place automated phone calls to Madison Valley residents to warn of exceptionally heavy rains.

Brad Colman, meteorologist in charge of the Weather Service's Seattle forecast office, said a coastal radar could be "a welcome tool," although the agency's official position is that the existing network of Doppler sites is adequate.

The locations were chosen in the early 1990s to meet the combined needs of the Weather Service, Federal Aviation Administration and the Department of Defense. The Camano Island location, Colman said, was chosen because of the view it offers of the Puget Sound area's population centers and airports. At McChord Air Force Base, officials use Doppler radar to gauge the timing, movement and size of thunderstorms to aid in decisions such as when to move the base's aircraft and other support equipment into hangars.

Colman said NOAA officials are concerned that if Congress decides a radar station is desirable but doesn't provide sufficient funds to install, operate and maintain it, it could become an "unfunded mandate" competing against other priorities in the Weather Service's budget.

He said storms approaching the Washington coast are examined not just by satellite but also by high-altitude radar and by offshore buoys, which transmit information on winds, temperature, barometric pressure, and the height and direction of waves and swells.

"We would certainly welcome a coastal radar and it would undoubtedly help in our forecast process," Colman said. "It wouldn't be an immediate panacea or silver bullet. It would be another tool in the toolbox."

Support for a coastal radar is particularly high among officials in coastal communities.

"We're blind without it," said Paul Easter, emergency-management director for Grays Harbor County, which is routinely battered by winter storms. "We've been told by weather services that many times they are unaware of what we're going to be faced with until it hits land," Easter said. "And basically, we're the land that it hits."

Jack Broom: 206-464-2222 or jbroom@seattletimes.com

Copyright 2008 The Seattle Times Company

 

 In accordance with Title 17 U.S.C. Section 107, this material is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes. Willapa Magazine  has no affiliation whatsoever with the originator of this article.

Westport Cam.com

Published by SwanDeer Productions
Arthur and Lietta Ruger, Bay Center, Willapa Bay in Pacific County Washington

 

Willapa Magazine 2007 is an internet journal based in Bay Center, Washington. The opinions expressed by Arthur or Lietta Ruger are the writers' own. Willapa Magazine recognizes Fair Use law and publishes original writings in their entirety based on 'fair use' of any such copyrighted material as provided for in section 107 of the US Copyright Law. Willapa Magazine Permission of author(s) ia required for reprinting original Willapa Magazine writings and the original author(s) for material posted under fair use law.