A new global map of subduction zones – which occur at the edge of tectonic plates – to predict which ones are capable of generating giant earthquakes
A team of international researchers, led by Monash University’s Associate Professor Wouter Schellart, have developed a new global map of subduction zones – which occur at the edge of tectonic plates – to predict which ones are capable of generating giant earthquakes.
The new research, published in the journal Physics of the Earth and Planetary Interiors, comes nine years after the giant earthquake and tsunami in Sumatra in December 2004, which devastated the region and many other areas surrounding the Indian Ocean, and killed more than 200,000 people.
Since then two other giant earthquakes have occurred at subduction zones, one in Chile in February 2010 and one in Japan in March 2011, which both caused massive destruction, killed many thousands of people and resulted in billions of dollars of damage.
Most earthquakes occur at the boundaries between tectonic plates that cover the Earth’s surface. The largest earthquakes on Earth only occur at subduction zones, plate boundaries where one plate sinks (subducts) below the other into the Earth’s interior. So far, seismologists have recorded giant earthquakes for only a limited number of subduction zone segments. But accurate seismological records go back to only ~1900, and the recurrence time of giant earthquakes can be many hundreds of years.
“The main question is, are all subduction segments capable of generating giant earthquakes, or only some of them? And if only a limited number of them, then how can we identify these,” Dr Schellart said.
Dr Schellart, of the School of Geosciences, and Professor Nick Rawlinson from the University of Aberdeen in Scotland used earthquake data going back to 1900 and data from subduction zones to map the main characteristics of all active subduction zones on Earth. They investigated if those subduction segments that have experienced a giant earthquake share commonalities in their physical, geometrical and geological properties.
They found that the main indicators include the style of deformation in the plate overlying the subduction zone, the level of stress at the subduction zone, the dip angle of the subduction zone, as well as the curvature of the subduction zone plate boundary and the rate at which it moves.
Through these findings Dr Schellart has identified several subduction zone regions capable of generating giant earthquakes, including the Lesser Antilles, Mexico-Central America, Greece, the Makran, Sunda, North Sulawesi and Hikurangi.
The Latest on: Giant earthquakes
via Google News
The Latest on: Giant earthquakes
- The Post-Earthquake Villageon March 23, 2020 at 7:40 am
You wake up to find despair waiting for you. The open-ended series of deaths surpasses your tolerance level. In the morning news, you can smell the scent of funerals prepared overnight by the Kitchen ...
- Scientists Didn't Know Much About Earthquakes Before 1933on March 13, 2020 at 6:21 pm
On March 10, 1933, a major earthquake caught the Los Angeles area by surprise. The devastation was of sufficient scale to spur scientific interest in earthquakes—and how to predict them.
- What is an earthquake?on March 11, 2020 at 11:05 am
An earthquake is the sudden shaking of the Earth's surface caused by movements and collisions of large masses of rock. The release of energy in the Earth's crust and upper mantle causes shock waves - ...
- Tomography of the source zone of the great 2011 Tohoku earthquakeon March 2, 2020 at 4:00 pm
The mechanism and rupture process of the giant 2011 Tohoku-oki earthquake (Mw 9.0) are still poorly understood due to lack of permanent near-field observations. Using seismic arrival times ...
- 1925: After blizzards and floods, ‘terror reigns’ when Syracuse shaken by earthquake (and giant sewer rats!)on February 28, 2020 at 2:56 pm
floods and earthquakes, the people of Syracuse must have thought that the city was cursed during the first two months of 1925. As if those things were not enough, there were reports of giant sewer ...
- Slipping and stressed Wairarapa fault line could produce 'giant earthquakes' - reporton February 26, 2020 at 4:00 pm
Cracks beneath Wairarapa have been put under new pressure by the 2016 Kaikōura earthquake, increasing the potential for "giant earthquakes" that could damage large swathes of the country.
- Large fault line 'loaded with pressure' with potential to cause 'giant' quakeson February 26, 2020 at 3:37 pm
New research has found the Wairarapa fault line was stressed during the 2016 Kaikōura quake, increasing the potential for "giant earthquakes". The study, published in Scientific Reports earlier ...
- Earthquakes’ tribute to Chris Wondolowski: A street named ‘Wondo Way’on February 23, 2020 at 8:18 am
The Earthquakes have filed a permit request with ... parking lot for Coleman Highline mixed-use complex, where streaming giant Roku is headquartered. Plans call for the street to eventually ...
- The Death of Mao: The Tangshan Earthquake and the Birth of the New China by James Palmeron February 15, 2020 at 4:00 pm
With the country’s leader, Chairman Mao, gripped by a debilitating illness, a giant earthquake struck the coal city of Tangshan in the early morning of July 28. The scale of the devastation was ...
- Seismic Seicheson January 24, 2020 at 1:56 pm
Definition of seismic seiches and examples dating back to their first public mention in 1755. Seismic seiches are standing waves set up on rivers, reservoirs, ponds, and lakes when seismic waves from ...
via Bing News