International joint workshop on Slow-to-fast earthquakes, 2023
Tokyo, JapanI am Gaspard Farge, a postdoc researcher in the University of California Santa Cruz. I
had the pleasure to participate in the workshop to present a poster on my research on
the role of dynamic uid circulation processes in shaping tremor spatio-temporal
activity patterns, in the deep subduction fault in particular. I am grateful to havereceived a travel grant from the organizing committee that covered housing,transportation to and from the airport, and daily expenses during the workshop. Thisworkshop was a unique opportunity for me to discuss slow earthquake science withscientists with a variety of expertise, and I think the organization really served thispurpose.
The workshop lasted 5 days, starting with an early career event on the rst day,scienti c sessions on the next 3 days, and ending with a eld trip on the last day.
The early career workshop was a very nice initiative, to have early career researcher
present to students and other early career researchers. It was a good way to get toknow a few of the other participants before the start of the workshop. The event wasgeared towards Japanese-speaking attendants, but although I am not Japanesespeaking, the talks were given with slides in English, which still allowed me to bene t
from the very pedagogical presentations that were given, by Dr Arai and Dr Uno.

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The scienti c sessions lasted three days. They were organized around morning andafternoon oral sessions, and a poster break around lunch on the rst two days.
I believe the oral sessions were organized around di erent disciplines (experimentalresearch, geologic studies, geodetic studies…), and I thought it produced very goodinteraction between talks: speakers reacting to previous presentations, links could
easily be made between di erent studies. The keynote talks really gave a backbone tothe sessions, and were great material for discussion for the next speakers, or during
poster sessions and breakout discussion. The poster sessions were the perfect scale
to have more than enough studies to have interesting discussions for the workshop,
while still feeling that we were not missing too much. However, I think that having times
for each presenter to be in front of their poster would facilitate interactions between
attendees. Breakout sessions surprisingly truly bene ted from the lack of structure, it
allowed for free discussion around an array of subjects, and for diversion away fromthe suggested themes, into areas that seemed to matter to all attendees, eg how tobetter communicate about slow earthquakes, between expert communities, to nonexpert scienti c communities, to students, to the general public. This preoccupation isexactly at the backbone of the Slow-to-fast earthquake project, which attempts tobuild a community of scientist and understanding around the subject — I therefore
think the workshop really served its purpose.

We spent the last day touring the Chiba peninsula looking at terraces from historic
earthquakes in the Tokyo region. It was great to see direct evidence of uplift in bio
markers, and quite impressive to see the amplitude of the vertical deformation, eventhat far from the rupture plane.

Marine terraces elevated from historical earthquakes, a maximum of about 1.5m of uplift forthe 1923 for the great Kanto earthquake, as shown by remains of oysters far above the waterline.