JpGU Meeting 2019
Session outline| Solid Earth Sciences (S) | ||
|---|---|---|
| Session Sub-category | Science of the Earth's Interior & Tectonophysics(IT) | |
| Session ID | S-IT24 | |
| Title | Attenuation from crust to core: in situ experiments, observaions and implications | |
| Short Title | Attenuation from crust to core | |
| Main Convener | Name | Konishi Kensuke |
| Affiliation | Institute of Earth Sciences, Academia Sinica | |
| Co-Convener 1 | Name | Ikuo Katayama |
| Affiliation | Department of Earth and Planetary Systems Science, Hiroshima University | |
| Co-Convener 2 | Name | Takashi Yoshino |
| Affiliation | Institute for Planetary Materials, Okayama University | |
| Co-Convener 3 | Name | Alexandre Schubnel |
| Affiliation | CNRS | |
| Session Language | E | |
| Scope | Most tomographic studies have been focused upon drawing maps of seismic velocity (SV) structures based on seismic data, with the ultimate goal of learning more about the structure and the composition of the mantle. Another key physical property that is accessible from seismic data is seismic attenuation (SA). Due to complications in isolating its intrinsic causes - e.g. local physical changes - and its extrinsic contributions - mainly scattering and other wave-propagation effects - SA has been underutilized. Yet, advances in waveform inversion have in association with recent enhancements of data permitted for a finer, more comprehensive determination of SA, opening the way to structural interpretations. Difficulties in classifying and modelling the possible causes of intrinsic SA - e.g. temperature, melt, volatiles, and grain size - have also been raised. Increasingly, theoretical and experimental mineral physics have come to document the relationship between the behavior of SA and an assortment of other phenomena - most particularly, partial melt. These results can subsequently be used interpret seismological observations. Seismic attenuation is critically implicated in structure, composition, and in fine mantle dynamics at the local, regional, and global scales. It may be used to constrain the existence of water in the transition zone; the presence of melt in various regions - for instance around subduction zones; and in the temperature field of the deep mantle - which would, in turn, help to resolve the chemical contribution to SV observed in this region. In this session, we would like to discuss aspects of mantle attenuation, with the aim of sharing the current state of all relevant fields of study. We welcome contributions from different fields - in particular, from seismology, mineral physics, and geodynamics, as these may advance our mutual comprehension of SA and its implications; and lay the groundwork for future research and applications thereof. | |
| Presentation Format | Oral and Poster presentation | |
| Invited Authors | Jerome Fortin (Ecole Normale Superieure - Paris) Yasuko Takei (Earthquake Research Institute, University of Tokyo) Nozomu Takeuchi (Earthquake Research Institute, University of Tokyo) | |
| Time | Presentation No | Title | Presenter | Abstract |
|---|---|---|---|---|
| Oral Presentation May 26 AM1 | ||||
| 09:00 - 09:15 | SIT24-01 | Anomalous Vp/Vs Ratios at Seismic Frequencies Might Evidence Highly Damaged Rocks in Subduction Zones | Alexandre Schubnel | |
| 09:15 - 09:30 | SIT24-02 | Imaging crustal seismic attenuation, central Taupo Volcanic Zone, New Zealand | Stephen C Bannister | |
| 09:30 - 09:45 | SIT24-03 | New Constraints on Seismological Structures of the Oceanic Asthenosphere | Nozomu Takeuchi | |
| 09:45 - 10:00 | SIT24-04 | Frequency effects on elastic properties of saturated porous rocks: Experimental investigations | Jerome Fortin | |
| 10:00 - 10:15 | SIT24-05 | Rock anelasticity due to grain boundary premelting | Yasuko Takei | |
| 10:15 - 10:30 | SIT24-06 | Experimental study of the effects of partial melting on anelasticity: toward quantitative interpretations of seismic high attenuation | Hatsuki Yamauchi | |
| Presentation No | Title | Presenter | Abstract |
|---|---|---|---|
| Poster Presentation May 26 PM2 | |||
| SIT24-P01 | Attenuation of seismic wave in water-saturated granite during triaxial deformation | Ikuo Katayama | |
| SIT24-P02 | Waveform inversion for the radial elastic and anelastic structure of the lowermost mantle beneath Central America and the Caribbean | Anselme F. E. Borgeaud | |
| SIT24-P03 | 3-D elastic and anelastic structure of the lowermost mantle beneath the western Pacific from finite-frequency tomography | Konishi Kensuke | |
| SIT24-P04 | Inferring the lowermost mantle thermo-chemical structure beneath the Western Pacific with seismic attenuation and shear-wave speed anomalies | Frederic Deschamps | |
| SIT24-P05 | Intrinsic attenuation factor Q of partially molten Fe–S–O system | Chao Liu | |
| SIT24-P06 | Effect of pore pressure on attenuation of seismic waves in thermally cracked granite | Keiya Yamada | |