Contact Information:

Media Contact

Julie Cohen
julie.cohen@ucsb.edu
805-893-7220

Twitter: ucsantabarbara

http://www.ucsb.edu




Kredyty mieszkaniowe Kredyty mieszkaniowe

Sprawdź aktualny ranking najlepszych kredytów mieszkaniowych w Polsce - atrakcyjne kredytowanie nieruchomości.

PRESS-NEWS.org - Press Release Distribution
FREE PRESS RELEASES DISTRIBUTION
RSS - Press News Release
Add Press Release

California rising

Spatially corrected sea-level records for the Pacific coast indicate that uplift rates are overestimated


California rising
2015-09-03
(Press-News.org) For millions of years, the Pacific and North American plates have been sliding past -- and crashing into -- one another. This ongoing conflict creates uplift, the geological phenomenon that formed mountains along the west coast.

A new analysis by UC Santa Barbara earth scientist Alex Simms demonstrates that the Pacific coastlines of North America are not uplifting as rapidly as previously thought. The results appear in the journal Geological Society of America Bulletin.

"Current models overestimate uplift rates by an average of 40 percent," said Simms, an associate professor in UCSB's Department of Earth Science. "They do not take into account glacio-isostatic adjustment, the Earth's response to the melting and growth of past ice sheets. Previous studies of the Pacific coast, including California, have ignored this when trying to use past sea levels to calculate uplift rates."

Uplift is the vertical elevation of the Earth's surface in response to plate tectonics.

Scientists determine uplift rates by measuring marine terraces -- flat mesas that indicate where the ocean level used to be -- and comparing their elevations to geologic records of sea-level change. However, traditionally used "global" sea-level records come from places like the Huon Peninsula of Papua New Guinea, far away from the ice sheets that once covered Canada. That's a problem because the freezing of water into ice sheets and its subsequent thawing actually changed the shape of the Earth ever so slightly -- and this deformation affects ocean levels.

According to Simms, the land responds the way a mattress does, indenting from weight and then relaxing back to its original shape. The Earth's gravitation field also changes in response to the building up and melting of these ice sheets. These changes to the land and Earth's gravity cause past sea levels to vary across the world. Most of this glacio-isostatic adjustment is not caused by current glacier melt but by the rebound of the Earth from the several-kilometer-thick ice sheets that covered much of Canada 20,000 years ago.

Simms and his colleagues compiled existing elevation measurement data from more than two dozen sites ranging from mid-Oregon to Baja California. They then recalculated uplift rates for each, applying a correction for glacio-isostatic adjustment.

Some areas are affected to a greater degree than others. The uplift rate for Punta Cabras in Baja California showed the largest difference: 72 percent lower than previous estimates. The rate for the San Diego area was reduced by 62 percent. For other areas, the rate changes were not as dramatic.

"Areas in Oregon are moving so fast that when you add the correction, the adjustment is much smaller: 10 to 20 percent," Simms said. "If a site is going up 100 meters versus 90 meters, that's not a big change. Here, sea level changed differently because of the distance from where these big ice sheets used to be."

This study provides one of the first spatially corrected sea-level records for California. "A 2012 study looked at one spot with one model, but we looked at variation across the state," Simms explained. "Now our data can be applied not only in California but along the Pacific coast of North America."

INFORMATION:

The study's co-authors are Hélène Rouby of the Laboratoire de Géologie de l'Ecole normale supérieure in Paris and Kurt Lambeck of The Australian National University in Canberra.


[Attachments] See images for this press release:
California rising California rising 2 California rising 3

ELSE PRESS RELEASES FROM THIS DATE:

NASA's GPM sees Hurricane Jimena's eroding eyewall

NASAs GPM sees Hurricane Jimenas eroding eyewall
2015-09-03
Hurricane Jimena, a once powerful Category 4 storm with maximum sustained winds estimated at 140 mph by the National Hurricane Center, has continued to weaken well east of Hawaii. The Global Precipitation Measurement or GPM core satellite analyzed rainfall rates and saw the eyewall was eroding. The eyewall of a hurricane contains a storm's most damaging winds and intense rainfall. It consists of a vertical wall of powerful thunderstorms circling a hurricane's open eye. GPM is a joint mission between NASA and the Japanese space agency JAXA. GPM captured data on Jimena ...

Could more intensive farming practices benefit tropical birds?

Could more intensive farming practices benefit tropical birds?
2015-09-03
The world is facing an extinction crisis as more and more forests are converted into farmland. But does it help when farms share the land with birds and other animals? The short answer is "no," according to new evidence based on the diversity of bird species reported in the Cell Press journal Current Biology on September 3. If the goal is to preserve more bird species, representing a greater span of evolutionary history, then it's better to farm more intensively in some areas while leaving more blocks of land entirely alone. In other words, land-sparing wins out over ...

Health risks of saturated fats aggravated by immune response

2015-09-03
High levels of saturated fat in the blood could make an individual more prone to inflammation and tissue damage, a new study suggests. Received wisdom on the health risks of eating saturated fat has been called into question recently. This new research supports the view that excessive consumption of saturated fat can be bad for us. Scientists from Imperial College London studied mice that have an unusually high level of saturated fat circulating in their blood. The research, published today (3 September 2015) in Cell Reports shows that the presence of saturated fats ...

Aspirin could hold the key to supercharged cancer immunotherapy

2015-09-03
Giving cancer patients aspirin at the same time as immunotherapy could dramatically boost the effectiveness of the treatment, according to new research published in the journal Cell today (Thursday). Francis Crick Institute researchers, funded by Cancer Research UK, have shown that skin, breast and bowel cancer cells often produce large amounts of prostaglandin E2 (PGE2). This molecule dampens down the immune system's normal response to attack faulty cells, which helps cancer to hide. It is a trick that allows the tumour to thrive and may explain why some immunotherapy ...

Laughter, then love: Study explores why humor is important in romantic attraction

2015-09-03
LAWRENCE - Men might want to ditch the pickup lines and polish their punchlines in their quest to attract women, new research at the University of Kansas suggests. Jeffrey Hall, associate professor of communication studies, found that when two strangers meet, the more times a man tries to be funny and the more a woman laughs at those attempts, the more likely it is for the woman to be interested in dating. However, an even better indicator of romantic connection is if the two are spotted laughing together. Those findings were among the discoveries Hall made in his search ...

New model of cognitive flexibility gives insight into autism spectrum disorder

2015-09-03
Coral Gables, Fla. (September 1, 2015) - Cognitive flexibility is the ability to shift our thoughts and adapt our behavior to the changing environment. In other words, it's one's ability to disengage from a previous task and respond effectively to a new one. It's a faculty that most of us take for granted, yet an essential skill to navigate life. In a new paper published in the journal Trends in Neurosciences, University of Miami (UM) College of Arts & Sciences researchers clarify many of the concepts surrounding cognitive flexibility and propose a model of its underlying ...

One step closer to cheaper antivenom

2015-09-03
Researchers involved in an international collaboration across six institutions, including the University of Copenhagen and the National Aquarium of Denmark (Den Blå Planet), have successfully identified the exact composition of sea snake venom, which makes the future development of synthetic antivenoms more realistic. Currently, sea snake anitvenom costs nearly USD 2000, yet these new findings could result in a future production of synthetic antivenoms for as little as USD 10-100. Venomous snakebites represent a major health concern in many tropical and subtropical ...

Ice sheets may be more resilient than thought, say Stanford scientists

Ice sheets may be more resilient than thought, say Stanford scientists
2015-09-03
Sea level rise poses one of the biggest threats to human systems in a globally warming world, potentially causing trillions of dollars' worth of damages to flooded cities around the world. As surface temperatures rise, ice sheets are melting at record rates and sea levels are rising. But there may be some good news amid the worry. Sea levels may not rise as high as assumed. To predict sea level changes, scientists look to Earth's distant past, when climate conditions were similar to today, and investigate how the planet's ice sheets responded then to warmer temperatures ...

Targeting glucose production in liver may lead to new diabetes therapies

2015-09-03
High blood sugar is a defining characteristic of Type 2 diabetes and the cause of many of the condition's complications, including kidney failure, heart disease, and blindness. Most diabetes medications aim to maintain normal blood sugar (glucose) levels and prevent high blood sugar by controlling insulin. A new University of Iowa study shows that another biological checkpoint, known as the Mitochondrial Pyruvate Carrier (MPC), is critical for controlling glucose production in the liver and could potentially be a new target for drugs to treat diabetes. The study, led ...

'Littlest' quark-gluon plasma revealed by physicists using Large Hadron Collider

Littlest quark-gluon plasma revealed by physicists using Large Hadron Collider
2015-09-03
LAWRENCE -- Researchers at the University of Kansas working with an international team at the Large Hadron Collider have produced quark-gluon plasma -- a state of matter thought to have existed right at the birth of the universe -- with fewer particles than previously thought possible. The material was discovered by colliding protons with lead nuclei at high energy inside the supercollider's Compact Muon Solenoid detector. Physicists have dubbed the resulting plasma the "littlest liquid." "Before the CMS experimental results, it had been thought the medium created in ...

LAST 30 PRESS RELEASES:

How your brain decides blame and punishment -- and how it can be changed

Uniquely human brain region enables punishment decisions

Pinpointing punishment

Chapman University publishes research on attractiveness and mating

E-cigarettes: Special issue from Nicotine & Tobacco Research

Placental problems in early pregnancy associated with 5-fold increased risk of OB & fetal disorders

UT study: Invasive brood parasites a threat to native bird species

Criminals acquire guns through social connections

Restoring ocean health

Report: Cancer remains leading cause of death in US Hispanics

Twin study suggests genetic factors contribute to insomnia in adults

To be fragrant or not: Why do some male hairstreak butterflies lack scent organs?

International team discovers natural defense against HIV

Bolivian biodiversity observatory takes its first steps

Choice of college major influences lifetime earnings more than simply getting a degree

Dominant strain of drug-resistant MRSA decreases in hospitals, but persists in community

Synthetic biology needs robust safety mechanisms before real world application

US defense agencies increase investment in federal synthetic biology research

Robots help to map England's only deep-water Marine Conservation Zone

Mayo researchers identify protein -- may predict who will respond to PD-1 immunotherapy for melanoma

How much water do US fracking operations really use?

New approach to mammograms could improve reliability

The influence of citizen science grows despite some resistance

Unlocking secrets of how fossils form

What happens on the molecular level when smog gets into the lungs?

Using ultrasound to clean medical instruments

Platinum and iron oxide working together get the job done

Tiny silica particles could be used to repair damaged teeth, research shows

A quantum lab for everyone

No way? Charity's logo may influence perception of food in package

[Press-News.org] California rising
Spatially corrected sea-level records for the Pacific coast indicate that uplift rates are overestimated
Press-News.org is a service of DragonFly Company. All Rights Reserved.
Issuers of news releases are solely responsible for the accuracy of their content.