Visiting Researchers
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Institute |
Institut de Physique du Globe de Paris |
Title |
Professor | |
Country |
France | |
Period of Stay |
2018/07/11 ~ 2018/7/26 | |
Research Theme |
Sea level change of Ryukyu Arc based on microatolls | |
Host Researcher |
Kenji SATAKE |
Self-Introduction
Nathalie Feuillet is professor at IPGP specialist in active tectonics and
paleoseismology. She was invited at ERI between July 11 and July 26 by
the Professor Kenji Satake to work on a common project dedicated to the
study of microatolls in the Ryukyu islands. Our goal is to better constrain
the seismogenic potential of the Ryukyu trench by quantifying long term
and short-term deformation of the Ryukyu Islands due to the seismic cycles
at plate interface. To this goal we use the record of coral microatolls*
and reef terraces. We already identified and cut several microatolls in
Okinawa and Yoron islands. In September 2017, we mainly worked in Miyakojima
and Yaeyama islands to identify and select several microatolls. A second
fieldtrip (between July 5 and 24) is ongoing in Yaeyama islands to cut
the microatolls we selected in September 2017. Nathalie Feuillet is participating
to the fieldtrip between July 11 and 24 and will be at ERI to work on the
data with the professor Kenji Satake between July 24 and 26.
* A microatoll is a colony of coral, which is dead on the top but living
around the perimeter. Its upward growth is constrained by sea level through
prolonged exposure at the lowest spring tides. Coral microatolls act as
natural recorders of sea-level changes due to climate and tectonics. They
are the only geological markers able to record tectonic movements with
a precision of few centimeters and over time scales ranging between one
and several thousands of years. They can be used to reconstruct the timing,
extent, and magnitude of past coseismic and interseismic deformation.