I am a seismologist with 12 years of observational experience across the Tohoku
forearc network, working mainly on real-time phase picking and slow-slip detection.
My picking algorithms run on 214 stations of the Kita-Sanriku array and cut median
alert latency from 9.2 to 5.6 seconds. I still log felt reports in a paper notebook,
out of habit rather than necessity.
SEC. 02
Seismogram · Career Record 2011–2026
COMP: Z · GAIN: 2000 · DRUM SPEED: 60 mm/minOP: J. EVERDEEN · TRACE: CONTINUOUS
Ev.
Phase
Mag.
Event description
E1
2013
M 4.1
First author paper on aftershock decay, Tohoku sequence
E2
2016
M 5.3
Ph.D. defended; picker prototype deployed on 40 stations
E3
2020
M 5.8
Promoted to senior analyst; latency program launched
E4
2023
M 6.2
Network-wide rollout, 214 stations; national bulletin adoption
SEC. 03
Station Bulletin · Appointments
Senior Seismic Analyst · Kita-Sanriku Geophysical Institute, Sendai
2020.04 – PRESENT
Origin time
Depth
Intensity
Station code
Quality
2020-04-01 09:00 JST
Senior grade
JMA 5+ (lead role)
KSG.SND
A
Lead a 6-person analysis group producing the daily regional bulletin, about 1,400 located events per year at RMS residual under 0.28 s.
Rebuilt the automatic P-wave picker; false trigger rate dropped from 7.1% to 1.9% across 214 stations over 3 field seasons.
Coordinated the 2024 offshore OBS campaign, 18 instruments recovered, 17 with full 11-month records.
Research Seismologist · Tohoku Crustal Dynamics Center, Sendai
2016.04 – 2020.03
Origin time
Depth
Intensity
Station code
Quality
2016-04-01 09:00 JST
Staff grade
JMA 4 (research)
TCD.SND
A
Detected 42 slow-slip episodes in the forearc using a matched-filter catalog of 3.6 million template correlations.
Maintained 31 borehole strainmeters; instrument uptime held at 98.4% through two typhoon seasons.
Hand-picked 21,000 phase arrivals for the 2011–2013 aftershock relocation catalog.
Ran the night observation shift 2 times per week; drum records archived with zero gaps over 4 years.
SEC. 04
Hypocenter · Education
Ph.D., Geophysics
Kitayama National University
2011 – 2016
Thesis: aftershock decay and stress transfer along the Sanriku margin. 4 refereed chapters.
B.Sc., Earth Sciences
Kitayama National University
2007 – 2011
Senior project: coda-Q mapping from 12 temporary stations.
SEC. 05
Intensity Scale · Methods
PHASE PICKING
VII
OBSPY / PYTHON
VI
MATCHED FILTERS
VI
OBS FIELD OPS
V
SAC / SEISAN
V
GNSS INVERSION
IV
JAPANESE
Native
ENGLISH
Working fluency, 40+ conference talks
SEC. 06
Selected Phase Reports · Publications
[R-24]Everdeen, K., et al. (2024). Low-latency phase association for dense forearc networks. Journal of Applied Seismometry, 61(3), 412–430.
[R-21]Everdeen, K. (2021). A five-year matched-filter catalog of slow slip beneath the Sanriku margin. Bulletin of Island Arc Geophysics, 48(2), 155–178.
[R-13]Everdeen, K., et al. (2013). Aftershock decay rates and drum-record completeness, 2011–2012. Tohoku Observatory Reports, 29, 71–88.