Reposted by qnishida.bsky.social
How can legacy seismic data be used to track changes in ocean waves? A new #SRL paper presents a newly digitized dataset from which the authors extract the ocean’s microseisms. ⚒️
buff.ly/gxTXvII
buff.ly/gxTXvII
July 27, 2026 at 3:00 AM
How can legacy seismic data be used to track changes in ocean waves? A new #SRL paper presents a newly digitized dataset from which the authors extract the ocean’s microseisms. ⚒️
buff.ly/gxTXvII
buff.ly/gxTXvII
The lecture notes on "Physics of seismic wave propagations" are now available on GitHub. github.com/qnishida/sei...
These notes are incomplete compared to the Japanese version. But I believe it's better than nothing!
These notes are incomplete compared to the Japanese version. But I believe it's better than nothing!
GitHub - qnishida/seismic-wave-propagation-notes
Contribute to qnishida/seismic-wave-propagation-notes development by creating an account on GitHub.
github.com
August 13, 2026 at 10:56 AM
The lecture notes on "Physics of seismic wave propagations" are now available on GitHub. github.com/qnishida/sei...
These notes are incomplete compared to the Japanese version. But I believe it's better than nothing!
These notes are incomplete compared to the Japanese version. But I believe it's better than nothing!
Reposted by qnishida.bsky.social
こどもの眼・おとなの頭｜日本評論社 www.nippyo.co.jp/shop/book/98... おお！とうとうでてくるのか！数セミに相当前に連載されていた時枝正の数理本！すっかり忘れていたよ…
July 31, 2026 at 6:15 AM
こどもの眼・おとなの頭｜日本評論社 www.nippyo.co.jp/shop/book/98... おお！とうとうでてくるのか！数セミに相当前に連載されていた時枝正の数理本！すっかり忘れていたよ…
Reposted by qnishida.bsky.social
🌊 Talking about waves in ice. I'm updating my class notes to include some of these beautiful pictures: sea ice shattered by 400-m long swells odl.bzh/6f6m7-4X
June 11, 2026 at 5:01 AM
🌊 Talking about waves in ice. I'm updating my class notes to include some of these beautiful pictures: sea ice shattered by 400-m long swells odl.bzh/6f6m7-4X
Nishida, K. (2026). win32conv: A modern C implementation of WIN/WIN32 seismic data conversion tools (Version 1.0.0). doi.org/10.5281/zeno...
win32conv: A modern C implementation of WIN/WIN32 seismic data conversion tools
Overview A modern, refactored C implementation of WIN/WIN32 seismic data conversion tools. Tools win2sc / win2sc_batch Converts WIN files to SAC files. Output files are named as {STATION}.{COMPONENT}....
doi.org
May 10, 2026 at 10:35 AM
Nishida, K. (2026). win32conv: A modern C implementation of WIN/WIN32 seismic data conversion tools (Version 1.0.0). doi.org/10.5281/zeno...
Reposted by qnishida.bsky.social
News from #SSA2026: Using fiber optics to monitor the stick-slip events at the #Lantai landslide in northern #Taiwan, scientists show these events are linked strongly to #typhoon rainfall and #earthquake shaking buff.ly/DPfUvzY ⚒️
April 16, 2026 at 11:00 PM
News from #SSA2026: Using fiber optics to monitor the stick-slip events at the #Lantai landslide in northern #Taiwan, scientists show these events are linked strongly to #typhoon rainfall and #earthquake shaking buff.ly/DPfUvzY ⚒️
Reposted by qnishida.bsky.social
This is our first paper combining SWOT and seismology. I know 2 more in the pipeline and you can expect many to come. Faint phenomena that were too weak to be measured by other satellites can now help explain long-standing mysteries in Earth science with not-always-easy-to-interpret seismic signals.
April 9, 2026 at 3:18 PM
This is our first paper combining SWOT and seismology. I know 2 more in the pipeline and you can expect many to come. Faint phenomena that were too weak to be measured by other satellites can now help explain long-standing mysteries in Earth science with not-always-easy-to-interpret seismic signals.
Reposted by qnishida.bsky.social
Ocean waves make all sorts of noises ... including seismic noise, even at periods very close to 26 s, and these come mostly from one location in the Gulf of Guinea and are recorded worldwide. We now know which storms do it. www.nature.com/articles/s41...
Swell-driven bursts of 26 s and 16 s seismic spectral peaks in the Gulf of Guinea - Nature Communications
The study suggests that long-period seismic bursts are triggered by ocean swell through the activation of cracks and fluid movement in the crust, linking wave activity in the Gulf of Guinea to episodic seismic energy release.
www.nature.com
April 9, 2026 at 3:12 PM
Ocean waves make all sorts of noises ... including seismic noise, even at periods very close to 26 s, and these come mostly from one location in the Gulf of Guinea and are recorded worldwide. We now know which storms do it. www.nature.com/articles/s41...
Reposted by qnishida.bsky.social
Tower in Motion: Resonance Mode Analysis of Devils Tower; new from us, now published in GSA Today: www.geosociety.org/GSA/Publicat...
March 25, 2026 at 2:29 PM
Tower in Motion: Resonance Mode Analysis of Devils Tower; new from us, now published in GSA Today: www.geosociety.org/GSA/Publicat...
Just shared my lecture notes for my grad school class on "A theory of seismic wave propagations". Hope they’re helpful to anyone interested! www.eri.u-tokyo.ac.jp/people/knish...
Educational resources
www.eri.u-tokyo.ac.jp
March 25, 2026 at 9:19 AM
Just shared my lecture notes for my grad school class on "A theory of seismic wave propagations". Hope they’re helpful to anyone interested! www.eri.u-tokyo.ac.jp/people/knish...
地震波の中でも表面波がどう発生するかをデモするwebアプリ。半無限弾性体でのP-SV波動伝播シミュレーションを差分法で解いています。浅いところに震源置くとRayleigh波が発生するのが見えます。
www.eri.u-tokyo.ac.jp/people/knish...
www.eri.u-tokyo.ac.jp/people/knish...
2D P-SV Seismic Wave Simulation
www.eri.u-tokyo.ac.jp
March 20, 2026 at 3:51 AM
地震波の中でも表面波がどう発生するかをデモするwebアプリ。半無限弾性体でのP-SV波動伝播シミュレーションを差分法で解いています。浅いところに震源置くとRayleigh波が発生するのが見えます。
www.eri.u-tokyo.ac.jp/people/knish...
www.eri.u-tokyo.ac.jp/people/knish...
Reposted by qnishida.bsky.social
🌟OPEN ACCESS🌟 Calibration of seismometers used in networks such as the International Monitoring System, run by the CTBTO, is important for robust ground-motion measurements. A new #SRL paper presents ways to do this. ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...
pubs.geoscienceworld.org/ssa/srl/arti...
December 27, 2025 at 3:00 AM
🌟OPEN ACCESS🌟 Calibration of seismometers used in networks such as the International Monitoring System, run by the CTBTO, is important for robust ground-motion measurements. A new #SRL paper presents ways to do this. ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...
pubs.geoscienceworld.org/ssa/srl/arti...
Effect of ocean eddies on seismic T waves, Zhang et al., (2025). JASA Express Letters, 5(12), 127702. doi.org/10.1121/10.0...
Effect of ocean eddies on seismic T waves
Earthquakes excite sound waves along continental margins, T waves, that can propagate for thousands of kilometers in the ocean. The complex T waveforms are shap
doi.org
December 11, 2025 at 2:47 PM
Effect of ocean eddies on seismic T waves, Zhang et al., (2025). JASA Express Letters, 5(12), 127702. doi.org/10.1121/10.0...
Reposted by qnishida.bsky.social
Find out how his work as a "method developer" has taken Thanh-Son Phạm from the inner core to the ice sheets of Antarctica in this month's SSA At Work! www.seismosoc.org/news/at-work... 🧪 ⚒️
December 4, 2025 at 7:00 PM
Find out how his work as a "method developer" has taken Thanh-Son Phạm from the inner core to the ice sheets of Antarctica in this month's SSA At Work! www.seismosoc.org/news/at-work... 🧪 ⚒️
Reposted by qnishida.bsky.social
🏞️🔬 DAS deployment inside a river!!!
What can we learn from the first DAS deployment inside a river?
What can DAS detect from inside a river?
Read more: seismica.library.mcgill.ca/article/view...
#Seismology #DAS #FluvialGeomorphology #EnvironmentalSeismology #Hydrology
What can we learn from the first DAS deployment inside a river?
What can DAS detect from inside a river?
Read more: seismica.library.mcgill.ca/article/view...
#Seismology #DAS #FluvialGeomorphology #EnvironmentalSeismology #Hydrology
December 3, 2025 at 11:47 PM
🏞️🔬 DAS deployment inside a river!!!
What can we learn from the first DAS deployment inside a river?
What can DAS detect from inside a river?
Read more: seismica.library.mcgill.ca/article/view...
#Seismology #DAS #FluvialGeomorphology #EnvironmentalSeismology #Hydrology
What can we learn from the first DAS deployment inside a river?
What can DAS detect from inside a river?
Read more: seismica.library.mcgill.ca/article/view...
#Seismology #DAS #FluvialGeomorphology #EnvironmentalSeismology #Hydrology
Reposted by qnishida.bsky.social
🌟OPEN ACCESS🌟📣PRESS RELEASE📣SWOT Satellite Altimetry Observations and Source Model for the Tsunami from the 2025 M 8.8 Kamchatka Earthquake #TSR ⚒️
Press Release: www.seismosoc.org/news/tsunami...
Paper: pubs.geoscienceworld.org/ssa/tsr/arti...
Press Release: www.seismosoc.org/news/tsunami...
Paper: pubs.geoscienceworld.org/ssa/tsr/arti...
December 2, 2025 at 2:01 PM
🌟OPEN ACCESS🌟📣PRESS RELEASE📣SWOT Satellite Altimetry Observations and Source Model for the Tsunami from the 2025 M 8.8 Kamchatka Earthquake #TSR ⚒️
Press Release: www.seismosoc.org/news/tsunami...
Paper: pubs.geoscienceworld.org/ssa/tsr/arti...
Press Release: www.seismosoc.org/news/tsunami...
Paper: pubs.geoscienceworld.org/ssa/tsr/arti...
Reposted by qnishida.bsky.social
Masayoshi Someya has won for the paper 'Physics-Informed Neural Networks for Offshore Tsunami Data Assimilation' by Someya, Masayoshi; Furumura, Takashi, published 26th June 2025, doi.org/10.1093/gji/...
November 20, 2025 at 9:53 AM
Masayoshi Someya has won for the paper 'Physics-Informed Neural Networks for Offshore Tsunami Data Assimilation' by Someya, Masayoshi; Furumura, Takashi, published 26th June 2025, doi.org/10.1093/gji/...
Reposted by qnishida.bsky.social
In a new #BSSA paper, scientists use numerical simulations to examine the wavefield in urban environments, finding that low-frequency attenuation is controlled by a building’s motion. ⚒️
pubs.geoscienceworld.org/ssa/bssa/art...
pubs.geoscienceworld.org/ssa/bssa/art...
November 19, 2025 at 9:02 PM
In a new #BSSA paper, scientists use numerical simulations to examine the wavefield in urban environments, finding that low-frequency attenuation is controlled by a building’s motion. ⚒️
pubs.geoscienceworld.org/ssa/bssa/art...
pubs.geoscienceworld.org/ssa/bssa/art...
Reposted by qnishida.bsky.social
🌟OPEN ACCESS🌟 How do we know the details of Earth's core? A new #SRL paper looks at historical seismological studies that made early discoveries about the cores existence and structure. ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...
pubs.geoscienceworld.org/ssa/srl/arti...
November 15, 2025 at 3:00 AM
🌟OPEN ACCESS🌟 How do we know the details of Earth's core? A new #SRL paper looks at historical seismological studies that made early discoveries about the cores existence and structure. ⚒️
pubs.geoscienceworld.org/ssa/srl/arti...
pubs.geoscienceworld.org/ssa/srl/arti...
Reposted by qnishida.bsky.social
Scientists have found a way to identify individual crashing waves using infrasound—acoustic waves with frequencies below the threshold of human hearing.
eos.org/articles/sci...
eos.org/articles/sci...
Scientists Tune In to the Ocean’s Sound Waves - Eos
A new technique detects inaudible acoustic signals from crashing waves, opening up possibilities for monitoring sea and atmospheric conditions from shore.
eos.org
October 16, 2025 at 2:11 PM
Scientists have found a way to identify individual crashing waves using infrasound—acoustic waves with frequencies below the threshold of human hearing.
eos.org/articles/sci...
eos.org/articles/sci...
Reposted by qnishida.bsky.social
Wishing the best to all the friends and colleagues at JPL
NASA unit JPL to lay off about 550 workers, citing restructure
NASA unit JPL to lay off about 550 workers, citing restructure
The Jet Propulsion Laboratory is a research and development lab funded by NASA — the federal space agency — and managed by the Caltech.
cnb.cx
October 13, 2025 at 8:48 PM
Wishing the best to all the friends and colleagues at JPL
土星リングの地震学面白そう
Afigbo et al. (2025). Unveiling what makes Saturn ring: Quantifying the amplitudes of Saturn’s planetary normal‐mode oscillations and trends in C‐ring properties using kronoseismology (VII). JGR Planets, 130(4), e2024JE008710. doi.org/10.1029/2024...
Afigbo et al. (2025). Unveiling what makes Saturn ring: Quantifying the amplitudes of Saturn’s planetary normal‐mode oscillations and trends in C‐ring properties using kronoseismology (VII). JGR Planets, 130(4), e2024JE008710. doi.org/10.1029/2024...
Unveiling What Makes Saturn Ring: Quantifying the Amplitudes of Saturn's Planetary Normal‐Mode Oscillations and Trends in C‐Ring Properties Using Kronoseismology (VII)
C-ring density wave profiles are fit to linear density wave models in order to obtain information about Saturn's interior and the C-ring
The opacity and viscosity of the C-ring changes around 84,...
doi.org
October 8, 2025 at 4:59 AM
土星リングの地震学面白そう
Afigbo et al. (2025). Unveiling what makes Saturn ring: Quantifying the amplitudes of Saturn’s planetary normal‐mode oscillations and trends in C‐ring properties using kronoseismology (VII). JGR Planets, 130(4), e2024JE008710. doi.org/10.1029/2024...
Afigbo et al. (2025). Unveiling what makes Saturn ring: Quantifying the amplitudes of Saturn’s planetary normal‐mode oscillations and trends in C‐ring properties using kronoseismology (VII). JGR Planets, 130(4), e2024JE008710. doi.org/10.1029/2024...
Reposted by qnishida.bsky.social
サラ・オーグルヴィ『世界最高の辞典を作った名もなき人びと』（塩原道緒訳、早川書房、2025/09）
『オックスフォード英語辞典（OED）』は、英語の言葉について、書物に現れた用例を集めて載せる途方もない辞典です。
その用例収集には、多数のボランティアが関わっていたことが従来も知られていましたが、具体的にはよく分かっていませんでした。
本書は、第3版の編集に携わった著者が、用例蒐集の参加者「ディクショナリー・ピープル」（本書の原題でもあります）に光を当て、列伝風に紹介するすこぶるつきに面白い本です。
解説「みんな、OEDのイカした（一部イカれた）メンバーを紹介するよ！」を書きました。
『オックスフォード英語辞典（OED）』は、英語の言葉について、書物に現れた用例を集めて載せる途方もない辞典です。
その用例収集には、多数のボランティアが関わっていたことが従来も知られていましたが、具体的にはよく分かっていませんでした。
本書は、第3版の編集に携わった著者が、用例蒐集の参加者「ディクショナリー・ピープル」（本書の原題でもあります）に光を当て、列伝風に紹介するすこぶるつきに面白い本です。
解説「みんな、OEDのイカした（一部イカれた）メンバーを紹介するよ！」を書きました。
September 13, 2025 at 3:54 AM
サラ・オーグルヴィ『世界最高の辞典を作った名もなき人びと』（塩原道緒訳、早川書房、2025/09）
『オックスフォード英語辞典（OED）』は、英語の言葉について、書物に現れた用例を集めて載せる途方もない辞典です。
その用例収集には、多数のボランティアが関わっていたことが従来も知られていましたが、具体的にはよく分かっていませんでした。
本書は、第3版の編集に携わった著者が、用例蒐集の参加者「ディクショナリー・ピープル」（本書の原題でもあります）に光を当て、列伝風に紹介するすこぶるつきに面白い本です。
解説「みんな、OEDのイカした（一部イカれた）メンバーを紹介するよ！」を書きました。
『オックスフォード英語辞典（OED）』は、英語の言葉について、書物に現れた用例を集めて載せる途方もない辞典です。
その用例収集には、多数のボランティアが関わっていたことが従来も知られていましたが、具体的にはよく分かっていませんでした。
本書は、第3版の編集に携わった著者が、用例蒐集の参加者「ディクショナリー・ピープル」（本書の原題でもあります）に光を当て、列伝風に紹介するすこぶるつきに面白い本です。
解説「みんな、OEDのイカした（一部イカれた）メンバーを紹介するよ！」を書きました。
Reposted by qnishida.bsky.social
🌊 Waves from storms. These pictures by SWOT (maps of SSH, dynamic range is -0.1 to 0.1 cm except for the leftmost panel at -1 to +1 m) show swell from the same storm "Eddie". Eddie peaked on 21 December 2024. The storm with the largest ocean waves in the past 10 years. Each panel is 40 by 40 km.
August 29, 2025 at 12:14 PM
🌊 Waves from storms. These pictures by SWOT (maps of SSH, dynamic range is -0.1 to 0.1 cm except for the leftmost panel at -1 to +1 m) show swell from the same storm "Eddie". Eddie peaked on 21 December 2024. The storm with the largest ocean waves in the past 10 years. Each panel is 40 by 40 km.
Reposted by qnishida.bsky.social
Along‐Trajectory Acoustic Signal Variations Observed During the Hypersonic Re‐Entry of the OSIRIS‐REx Sample Return Capsule #SRL ⚒️
Sample return from asteroid Bennu can help scientists better understand how space junk enters the atmosphere.
pubs.geoscienceworld.org/ssa/srl/arti...
Sample return from asteroid Bennu can help scientists better understand how space junk enters the atmosphere.
pubs.geoscienceworld.org/ssa/srl/arti...
August 18, 2025 at 2:00 PM
Along‐Trajectory Acoustic Signal Variations Observed During the Hypersonic Re‐Entry of the OSIRIS‐REx Sample Return Capsule #SRL ⚒️
Sample return from asteroid Bennu can help scientists better understand how space junk enters the atmosphere.
pubs.geoscienceworld.org/ssa/srl/arti...
Sample return from asteroid Bennu can help scientists better understand how space junk enters the atmosphere.
pubs.geoscienceworld.org/ssa/srl/arti...