The earthquake disaster on 11 March 2011 was an event of the century not only for Japan. With a magnitude of Mw = 8.9, it was one of the strongest earthquakes ever recorded worldwide. Particularly interesting is that here, two days before, a strong foreshock with a magnitude Mw = 7.2 took place almost exactly at the breaking point of the tsunami-earthquake. The geophysicist Joachim Saul from the GFZ German Research Centre for Geosciences (Helmholtz Association) created an animation which shows the sequence of quakes since March 9.
The animated image is available at www.gfz-potsdam.de . It shows the earthquake activity in the region of Honshu, Japan, measured at the GFZ since 8 March 2011. After a seismically quiet 8th March, the morning (coordinated universal time UTC) of the March 9 began with an earthquake of magnitude 7.2 off the Japanese east coast, followed by a series of smaller aftershocks. The morning of March 11 sees the earthquake disaster that triggered the devastating tsunami. This earthquake is followed by many almost severe aftershocks, two of which almost reach the magnitude 8. In the following time period the activity slowly subsides, and is dominated today (March 16) by relatively small magnitude 5 quakes, though several earthquakes of magnitude 6 are being registered on a daily basis. The activity of aftershocks focuses mainly on the area of the March 11 earthquake. Based on the distribution of the aftershocks, the length of the fraction of the main quake can be estimated at about 400 km. Overall, 428 earthquakes in the region of Honshu were registered at the GFZ since March 9.
By analysing over 500 GPS stations, the GFZ scientists Rongjiang Wang and Thomas Walter have found that horizontal displacements of up to five meters in an eastern direction occurred at the east coast of Japan. The cause lies in the earthquake zone, i.e. at the contact interface of the Pacific plate with Japan. Computer simulations of this surface show that an offset of up to 25 meters occurred during the earthquake. Calculations of the GFZ modeling group headed by Stephan Sobolev even yielded a displacement of up to 27 meters and a vertical movement of seven meters. This caused an abrupt elevation in the deep sea, and thus triggered the tsunami. The images of the GPS displacement vectors and the computer simulations can also be found among the online material provided by the GFZ.
Already shortly after the quake Andrey Babeyko and Stephan Sobolev of the GFZ modeled the propagation and wave heights of the tsunami in the Pacific over the first 16 hours. The tremendous force of the earthquake is highlighted here, too: in the open Pacific, relatively large wave heights of over one meter were calculated, which agrees very well with the observations. How high the tsunami is piled up on the coast is largely determined by water depth and the shape of the coastline. The GFZ material also contains an image and an animation regarding this work.Click here for further information:
F. Ossing | EurekAlert!
NASA looks to solar eclipse to help understand Earth's energy system
21.07.2017 | NASA/Goddard Space Flight Center
Scientists shed light on carbon's descent into the deep Earth
19.07.2017 | European Synchrotron Radiation Facility
3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects
A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.
To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...
The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....
A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...
21.07.2017 | Event News
19.07.2017 | Event News
12.07.2017 | Event News
24.07.2017 | Power and Electrical Engineering
24.07.2017 | Materials Sciences
24.07.2017 | Materials Sciences