Report
Zahra Zandvakili

The conference started on September 13th. My presentation took
place on that day, along with other researchers who werepresenting their work conducted in the Hokkaido region. I had apresentation regarding the geochemistry anomaly of groundwater
before the 2018 Hokkaido eastern Iburi earthquake titled“Geofluid behavior prior to 2018 Hokkaido eastern Iburi
earthquake using groundwater geochemistry”. I Used the same
samples, Sano et al.2020 has already reported anomaly inhydrogen, oxygen, and carbon isotopic values several months
before the Eastern Iburi earthquake at the Uenae site. Sano et al.
(2020) indicated that CO2 influx into groundwater may haveoccurred based on the observed decrease in 13C isotopic ratio and14C data. I also observed significant decrease in the Na/K ratio at
the same time of changes in hydrogen, oxygen, and carbon isotopic
values before earthquake which Sano et al, reported in the nearest
site to the epicenter. Although the decrease in the Na/K ratio canbe explained by the contribution of deep-derived fluids, the result
from analyzing of Li and Sr isotope in this study indicate that thedecrease in the Na/K ratio in the Uenae site was not related toascending of the deep-seated fluids. Therefore, the pre-earthquake
decrease in the Na/K ratio observed in this study can also beexplained by the influx of deep-derived, waterless CO2 into thegroundwater. The theory of Sano et al., that pointed out that thechanges in carbon isotopic values that occurred before theearthquake at the Uenae site, caused by migration of CO2 frominjection site, is supported by the results of this study in terms ofthe absence of deep-derived fluids as well.

After the presentation, I received general comments about my research, but one comment specifically addressed the relationship between geochemical
anomalies and the types of stress present in the region. I was advised to consider how chemical elements behave under different types of stress, including
dilation and compression, as this could be crucial for interpreting my work.
The variations in the concentration of chemical elements may indeed be related to regional stress factors and may fluctuate depending on the type of stresspresent. Therefore, in addition to accounting for changes in chemical composition due to mixing with other fluids or gases, it's essential to take into account theinfluence of regional stress factors in our analysis.

During the poster session, I also
learned about some technical terms
that I needed to know for my next
project related to long-term SSE (slowslip events). I was able to enhance myconnections
byengaging
inconversations with other researchersand professors during the poster
session.
In the breakout session, we discussed
themissing
components
inearthquake
prediction,
theapplication of AI in slow earthquake
research, and the materials orstructures required for the study ofslow earthquakes. The result of ourconversation during the breakout
session was to classify the available
data for easier access.

This conference provided an excellent opportunity for me to enhance my knowledge of deep earthquake science andexpand my network with other researchers and professors, potentially leading to valuable opportunities in the future.