Contact Information:

Media Contact

F. Ossing
ossing@gfz-potsdam.de
49-331-288-1040

http://www.gfz-potsdam.de




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

Self-healing landscape: Landslides after earthquakes


2015-08-24
(Press-News.org) 21.08.2015: In mountainous regions earthquakes often cause strong landslides, which can be exacerbated by heavy rain. However, after an initial increase, the frequency of these mass wasting events, often enormous and dangerous, declines, in fact independently of meteorological events and aftershocks. These new findings are presented by a German-Franco-Japanese team of geoscientists in the current issue of the journal Geology, under the lead of the GFZ German Research Centre for Geosciences. Even after strong earthquake the activity of landslides returns back over the course of one to four years to the background level before the earthquake.

The interactions over time between earthquakes and processing shaping the landscape are still not well understood. The geoscientists have investigated areas affected by landslides related to four moderate to severe earthquakes (6.6 to 7.6 on Richter scale). "The main difficulty was that one must distinguish between the meteorological and the seismic causes of landsliding. Heavy rain can also produce landslides and can enhance landsliding after an earthquake", says GFZ scientists Marc Odin, the lead author of the study. Two processes are interacting here. A strong earthquake shakes soil layer loose from the underlying bedrock and also damages the rock below the top soil. Water seeps into the resulting the cracks and crevices and acts like a lubricating film on which a mountain slope slides into the valley. With the present results of the team of geoscientists, this conceptual model has to be modified. "We analytically separated the effect of the rain from the seismic activity and so were able to determine that the decrease of landslides through time is based on an internal healing process of the landscape," said Marc Odin. The destabilization of the landscape caused by the quake gradually recovers. In the course of months to years, depending on weather, rocks and the strength of the earthquake, the slide rates return to the pre-earthquake level: The cracks slowly get closed again or are filled with sand and earth. The landscape self-heals its underlayer and returns to its background hazard potential. This research is highly relevant: currently the GFZ analyzes these processes in the context of the Nepal-quake of April this year: "We had the chance to start a series of measurements directly after the quake and continue for the next few years," explained Niels Hovius, Head of the Section "Geomorphology" at the GFZ, about the current deployment of his team in the Himalayas.

INFORMATION:

O. Marc, N. Hovius, P. Meunier, T. Uchida, and S. Hayashi, "Transient changes of landslide rates after earthquakes", GEOLOGY, Advance Online Publication, 21.08.2015; doi:10.1130/G36961.1

Photo in a printable resolution: https://media.gfz-potsdam.de/gfz/wv/05_Medien_Kommunikation/Bildarchiv/Einzelbilder_Neuestes/Nepal_cracks_2015_Marc.jpg Caption: Large ground cracks on a small ridge and landslide in the background after the Nepal quake of April 2015, upper Bhote Koshi river valley, photo: O. Marc, GFZ


ELSE PRESS RELEASES FROM THIS DATE:

Smooth robot movements reduce energy consumption by up to 40 percent

Smooth robot movements reduce energy consumption by up to 40 percent
2015-08-24
By minimizing the acceleration of industrial robots, energy consumption can be reduced by up to 40 percent - while retaining the given production time. This is the result of a new optimization algorithm that was developed by researchers at Chalmers University of Technology. Optimization of the robot's movements reduces acceleration and deceleration, as well as the time the robot is at a standstill since being at a standstill also consumes energy. "We simply let the robot move slower instead of waiting for other robots and machines to catch up before carrying out the ...

Blacks hit hardest by public-sector job losses during recession, study finds

2015-08-24
The public sector has long served as an equalizer in American society, a place where minority workers could find stable employment that offered advancement and a reliable path to a middle-class life. But the Great Recession wiped out many of those jobs, as tax revenues declined and anti-government sentiment added to a contraction that continued long after the Great Recession ended in 2008. Those job cuts disproportionately hurt African-American workers and increased racial disparity in the public sector, a new study by University of Washington sociologist Jennifer Laird ...

Researcher documents gender, class bias in enforcement of quarantine law

2015-08-24
CHICAGO -- As the World War I military draft brought to the forefront the high rate of venereal disease among the civilian population, states began to enact measures to quarantine people and begin forms of treatment to try to control syphilis, gonorrhea and other potential outbreaks. However, a University of Kansas (KU) researcher has documented examples of how this process continued well into peacetime and how these laws were generally enforced along lines of gender and class, especially punishing poor women. Nicole Perry, a University of Kansas graduate student in ...

Unlike boys, girls lose friends for having sex, gain friends for making out

2015-08-24
CHICAGO -- Early adolescent girls lose friends for having sex and gain friends for "making out," while their male peers lose friends for "making out" and gain friends for having sex, finds a new study that will be presented at the 110th Annual Meeting of the American Sociological Association (ASA). "In our sample of early adolescents, girls' friendship networks shrink significantly after they have sex, whereas boys' friendship networks expand significantly," said Derek A. Kreager, the lead author of the study and an associate professor of sociology and criminology at ...

Lightness/darkness of skin affects male immigrants' likelihood of gaining employment

2015-08-24
CHICAGO -- Skin color is a significant factor in the probability of employment for male immigrants to the United States, according to a new study by two University of Kansas (KU) researchers. The researchers, Andrea Gomez Cervantes, a doctoral candidate in sociology, and ChangHwan Kim, an associate professor of sociology, found that among men, darker skin color negatively influenced their likelihood of employment, even after accounting for the effects of race and other demographic and education related variables. The negative effect of darker skin color was particularly ...

Heart medications that target stress may help prolong survival in women with ovarian cancer

2015-08-24
A new analysis of patient records indicates that certain drugs taken to improve heart health may also have anti-cancer properties. Published early online in CANCER, a peer-reviewed journal of the American Cancer Society, the findings indicate that additional studies are warranted to determine whether patients with cancer may benefit from adding beta blockers to their treatment regimen. There is growing evidence that stress hormones can stimulate cancer to grow and spread. Beta blockers, which are drugs commonly used to treat hypertension and other heart-related conditions, ...

One in 5 over-65s who drink alcohol do so at unsafe levels

2015-08-24
One in five older people who drink alcohol are consuming it at unsafe levels - over 21 units of alcohol for men and 14 units for women each week - according to a study by King's College London. The research in inner-city London, published in BMJ Open, found these unsafe older drinkers are more likely to be of higher socioeconomic status. The researchers used anonymised electronic GP health records for 27,991 people aged 65 and over in the Borough of Lambeth in London. From these records, they identified 9,248 older people who had reported consuming alcohol and of these ...

New study indicates magnetic stimulation effective in reducing bed-wetting

2015-08-24
Amsterdam, NL, August 24, 2015 - Bedwetting, or nocturnal enuresis, causes distress in children and young adults, as well as for their parents or caregivers. The causes are not fully understood and there may be both physiological and psychological components to the condition. In a new study published in Restorative Neurology and Neuroscience, researchers report that repetitive sacral root magnetic stimulation (rSMS) can reduce the frequency of nighttime bedwetting and improve quality-of-life for sufferers. In a study conducted by researchers at the Assiut University Hospital, ...

Want a better relationship and a better sex life?

2015-08-23
CHICAGO-If men take up more of the child-care duties, splitting them equally with their female partners, heterosexual couples have more satisfaction with their relationships and their sex lives, according to new research by Georgia State University sociologists. The research was presented Aug. 23 at the annual meeting of the American Sociological Association. Daniel L. Carlson, along with graduate students Sarah Hanson and Andrea Fitzroy used data from more than 900 heterosexual couples' responses in the 2006 Marital Relationship Study (MARS). The researchers found ...

Polygamy and alcohol linked to physical abuse in African marriages

2015-08-23
CHICAGO -- African women in polygamous marriages or with alcoholic husbands have a significantly higher risk of being physically abused by their husbands than women in monogamous marriages or women whose husbands don't abuse alcohol, new research shows. A trio of researchers pulled data from the Demographic Health Survey to look at intimate partner physical violence in Ghana, Kenya, Malawi, and Zimbabwe. The four countries have high rates of domestic violence. The researchers selected the countries based on the availability of timely data and to represent different regions ...

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] Self-healing landscape: Landslides after earthquakes
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.