Attenuation structure beneath the volcanic front in northeastern Japan from broad-band seismograms

2000 ◽  
Vol 121 (3-4) ◽  
pp. 339-357 ◽  
Author(s):  
Tetsuo Takanami ◽  
I. Selwyn Sacks ◽  
Akira Hasegawa
Keyword(s):  
Broad Band ◽  
Volcanic Front ◽  
Northeastern Japan ◽  
Attenuation Structure

scholarly journals Attenuation contrast in mantle wedge across the volcanic front of northeastern Japan that controls propagations of high-frequency S-wave later phases

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Takahiro Shiina ◽  
Kei Katsumata ◽  
Kiyoshi Yomogida ◽  
Aitaro Kato
Keyword(s):  
High Frequency ◽  
Mantle Wedge ◽  
Volcanic Front ◽  
S Wave ◽  
High Attenuation ◽  
Northeastern Japan ◽  
Pass Through ◽  
High Frequency Waves ◽  
Forearc Region ◽  
Ne Japan

AbstractDistinct later phases of waves with rich high-frequency (> 8 Hz) components were observed for intraslab earthquakes that occurred at intermediate depths, particularly at depths exceeding 100 km, in the northeastern (NE) Japan subduction zone. These high-frequency later phases (HFLPs) showed anomalously large peak-amplitude delays, up to ~ 50 s after direct S-wave arrivals at stations in the backarc region. Using a source-scanning algorithm, we investigated the locations of passing points affecting the propagation of HFLPs. The passing points were estimated to be in the forearc region in the entire NE Japan, indicating that HFLPs are scattered waves that pass through the forearc region. The propagating HFLPs seem to bypass the backarc mantle wedge, as a consequence of the distinct attenuation contrast in the mantle wedge across the volcanic front in NE Japan. These HFLP observations suggest that the high-attenuation zone in the backarc mantle wedge controls propagations of the high-frequency waves of intraslab earthquakes, in addition to the scatterers possibly locate in the forearc region.

scholarly journals Shear wave velocity and attenuation structure of Ischia island using broad band seismic noise records

2020 ◽  
Vol 401 ◽  
pp. 106970
Author(s):  
L. Nardone ◽  
R. Manzo ◽  
D. Galluzzo ◽  
M. Pilz ◽  
S. Carannante ◽  
...  
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Seismic Noise ◽  
Broad Band ◽  
Ischia Island ◽  
Attenuation Structure

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

Chronic Laser Exposure Effects on Rabbit Retina

1972 ◽  
Vol 30 ◽  
pp. 54-55
Author(s):  
Burton B. Silver ◽  
Theodore Lawwill
Keyword(s):  
Laser Irradiation ◽  
Laser Light ◽  
Broad Band ◽  
Argon Laser ◽  
Atropine Sulfate ◽  
Ultrastructural Changes ◽  
Laser Exposure ◽  
Rabbit Retina ◽  
Histological Changes ◽  
Threshold Doses

Dutch-belted 1 to 2.5 kg anesthetized rabbits were exposed to either xenon or argon laser light administered in a broad band, designed to cover large areas of the retina. For laser exposure, the pupil was dilated with atropine sulfate 1% and pheny lephrine 10%. All of the laser generated power was within a band centered at 5145.0 Anstroms. Established threshold for 4 hour exposures to laser irradiation are in the order of 25-35 microwatts/cm2. Animals examined for ultrastructural changes received 4 hour threshold doses. These animals exhibited ERG, opthalmascopic, and histological changes consistent with threshold damage.One month following exposure the rabbits were killed with pentobarbitol. The eyes were immediately enucleated and dissected while bathed in 3% phosphate buffered gluteraldehyde.

Real-ear Masking Calibration for Portable Pure-Tone Audiometers

1984 ◽  
Vol 15 (4) ◽  
pp. 289-294
Author(s):  
Martin S. Robinette ◽  
Robert H. Brey
Keyword(s):  
Pure Tone ◽  
Broad Band ◽  
Resistive Network ◽  
Many Instruments

A transformer mixing network is described which allows the calibration of broad-band masking for portable audiometers that lack a built-in mixing network. For many instruments the transformer network is preferable to the resistive network previously published.

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