scholarly journals Determination of seismic attenuation structure and source strength by inversion of seismic intensity data: Tohoku district, northeastern Japan arc.

1987 ◽  
Vol 35 (1) ◽  
pp. 67-92 ◽  
Author(s):  
Toshihiko HASHIDA ◽  
Kunihiko SHIMAZAKI
Keyword(s):  
Seismic Intensity ◽  
Seismic Attenuation ◽  
Intensity Data ◽  
Source Strength ◽  
Northeastern Japan ◽  
Attenuation Structure

scholarly journals A tomography image of the Aegean region (Greece) derived from inversion of macroseismic intensity data

1997 ◽  
Vol 40 (1) ◽  
Author(s):  
G. N. Stavrakakis ◽  
G. Drakatos ◽  
G. Karantonis ◽  
D. Papanastassiou
Keyword(s):  
Lower Layer ◽  
Three Dimensional ◽  
Aegean Sea ◽  
Seismic Intensity ◽  
Seismic Attenuation ◽  
Intensity Data ◽  
Southeastern Part ◽  
Aegean Region ◽  
Mediterranean Regions ◽  
Attenuation Structure

The three-dimensional attenuation structure beneath the Aegean sea and the surrounding regions was determined by inversion of seismic intensity data. A large number of seismic intensity data have been accumulated in a uniform scale in the Aegean region, where the seismic activity is much higher than that of the other Mediterranean regions. Nearly 11000 seismic intensity data from 47 earthquakes that have occurred in these regions were used to determine the seismic attenuation structure. The resulting structure reveals a remarkable contrast of attenuation. In the top layer (depth 0-20 km), low Q is dominant in the central Aegean sea, while high Q is dominant in the surrounding land areas, except for Southwestern Turkey. The low-Q regions correspond to areas of Neogene-Quaternary grabens where the high seismicity of shallow earthquakes appears. In the lower layer (20-40 km) low-Q areas are located in the southeastern part of the Hellenic arc. Some low-Q spots corresponding to the distribution of volcanoes exist along the volcanic arc. The low-Q spots might correspond to diapirs causing subduction volcanism.

scholarly journals Detailed seismic attenuation structure beneath Hokkaido, northeastern Japan: Arc‐arc collision process, arc magmatism, and seismotectonics

2014 ◽  
Vol 119 (8) ◽  
pp. 6486-6511 ◽  
Author(s):  
Saeko Kita ◽  
Junichi Nakajima ◽  
Akira Hasegawa ◽  
Tomomi Okada ◽  
Kei Katsumata ◽  
...  
Keyword(s):  
Seismic Attenuation ◽  
Arc Magmatism ◽  
Collision Process ◽  
Northeastern Japan ◽  
Attenuation Structure

Direct phase determination in electron crystallography: small organic molecules

1992 ◽  
Vol 50 (2) ◽  
pp. 1166-1167
Author(s):  
Douglas L. Dorset
Keyword(s):  
Organic Molecules ◽  
Data Sets ◽  
Temperature Structure ◽  
3D Analysis ◽  
Intensity Data ◽  
Electron Crystallography ◽  
Phase Determination ◽  
Measured Intensity ◽  
3D Data

The quantitative use of electron diffraction intensity data for the determination of crystal structures represents the pioneering achievement in the electron crystallography of organic molecules, an effort largely begun by B. K. Vainshtein and his co-workers. However, despite numerous representative structure analyses yielding results consistent with X-ray determination, this entire effort was viewed with considerable mistrust by many crystallographers. This was no doubt due to the rather high crystallographic R-factors reported for some structures and, more importantly, the failure to convince many skeptics that the measured intensity data were adequate for ab initio structure determinations.We have recently demonstrated the utility of these data sets for structure analyses by direct phase determination based on the probabilistic estimate of three- and four-phase structure invariant sums. Examples include the structure of diketopiperazine using Vainshtein's 3D data, a similar 3D analysis of the room temperature structure of thiourea, and a zonal determination of the urea structure, the latter also based on data collected by the Moscow group.

DETERMINATION OF SEISMIC ATTENUATION BENEATH EAST SEA

2019 ◽  
Author(s):  
Nguyen Le Minh ◽  
Satoru Tanaka ◽  
Yasushi Ishihara ◽  
Nguyen Tien Hung ◽  
Ha Vinh Long ◽  
...  
Keyword(s):  
Seismic Attenuation ◽  
East Sea

Determination of Absolute from Relative X-Ray Intensity Data

Nature ◽  
1942 ◽  
Vol 150 (3796) ◽  
pp. 151-152 ◽  
Author(s):  
S. H. YÜ
Keyword(s):  
Intensity Data ◽  
X Ray
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