Sajjad Ahmadi
@sajjadahmadi.bsky.social
🌍Geodesy,🛰Remote Sensing💻,Geophysics🌋,University of Tehran🎓
Reposted by Sajjad Ahmadi
COMET is delighted to announce a range of funded PhD studentships across our world-leading research institutes.
🔗 Explore All Positions: 👉 comet.nerc.ac.uk/phd-opportun...
Don't miss this opportunity to join the COMET community and contribute to ground breaking research.
🔗 Explore All Positions: 👉 comet.nerc.ac.uk/phd-opportun...
Don't miss this opportunity to join the COMET community and contribute to ground breaking research.
November 20, 2025 at 1:49 PM
COMET is delighted to announce a range of funded PhD studentships across our world-leading research institutes.
🔗 Explore All Positions: 👉 comet.nerc.ac.uk/phd-opportun...
Don't miss this opportunity to join the COMET community and contribute to ground breaking research.
🔗 Explore All Positions: 👉 comet.nerc.ac.uk/phd-opportun...
Don't miss this opportunity to join the COMET community and contribute to ground breaking research.
Reposted by Sajjad Ahmadi
A huge thank you to everyone who participated in last week's COMET InSAR Training Workshop!
📹 Couldn't make it or want to revisit the sessions?
🔗https://www.youtube.com/@COMETWebinars
📅 Details for the 2026 InSAR Training Workshop will be announced on COMET Bluesky next year. Stay tuned!
📹 Couldn't make it or want to revisit the sessions?
🔗https://www.youtube.com/@COMETWebinars
📅 Details for the 2026 InSAR Training Workshop will be announced on COMET Bluesky next year. Stay tuned!
November 20, 2025 at 1:45 PM
A huge thank you to everyone who participated in last week's COMET InSAR Training Workshop!
📹 Couldn't make it or want to revisit the sessions?
🔗https://www.youtube.com/@COMETWebinars
📅 Details for the 2026 InSAR Training Workshop will be announced on COMET Bluesky next year. Stay tuned!
📹 Couldn't make it or want to revisit the sessions?
🔗https://www.youtube.com/@COMETWebinars
📅 Details for the 2026 InSAR Training Workshop will be announced on COMET Bluesky next year. Stay tuned!
Reposted by Sajjad Ahmadi
🎉 We want to congratulate COMET Scientist Susanna Ebmeier for her promotion to the position of Professor of Volcano Remote Sensing.
November 10, 2025 at 1:18 PM
🎉 We want to congratulate COMET Scientist Susanna Ebmeier for her promotion to the position of Professor of Volcano Remote Sensing.
Reposted by Sajjad Ahmadi
🎧 The latest COMET webinar is now available on YouTube!
If you missed last week’s live session, you can now watch the full recording here:
🔗 www.youtube.com/watch?v=tuhd...
If you missed last week’s live session, you can now watch the full recording here:
🔗 www.youtube.com/watch?v=tuhd...
COMET Webinar: Jin Fang. Satellite Geodetic Constraints on the Kinematics of the Tibetan Plateau
YouTube video by COMET Webinars
www.youtube.com
November 6, 2025 at 5:39 PM
🎧 The latest COMET webinar is now available on YouTube!
If you missed last week’s live session, you can now watch the full recording here:
🔗 www.youtube.com/watch?v=tuhd...
If you missed last week’s live session, you can now watch the full recording here:
🔗 www.youtube.com/watch?v=tuhd...
Reposted by Sajjad Ahmadi
Complex Multifault Rupture During the 2016–2025 Dingri Earthquakes, Southern Tibetan Plateau, Unraveled by Multisource InSAR Observations #SRL ⚒️
What can satellite data tell us about how the ground moved during and after three quakes in southern Tibet?
pubs.geoscienceworld.org/ssa/srl/arti...
What can satellite data tell us about how the ground moved during and after three quakes in southern Tibet?
pubs.geoscienceworld.org/ssa/srl/arti...
October 9, 2025 at 3:00 PM
Complex Multifault Rupture During the 2016–2025 Dingri Earthquakes, Southern Tibetan Plateau, Unraveled by Multisource InSAR Observations #SRL ⚒️
What can satellite data tell us about how the ground moved during and after three quakes in southern Tibet?
pubs.geoscienceworld.org/ssa/srl/arti...
What can satellite data tell us about how the ground moved during and after three quakes in southern Tibet?
pubs.geoscienceworld.org/ssa/srl/arti...
Reposted by Sajjad Ahmadi
Do Coupled Megathrusts Rupture?
In our new preprint, Bar Oryan and I present
the first global analysis of the relationship between kinematic geodetic coupling and earthquake slip models across 12 subduction zones and 61 megathrust earthquakes.
eartharxiv.org/repository/v...
In our new preprint, Bar Oryan and I present
the first global analysis of the relationship between kinematic geodetic coupling and earthquake slip models across 12 subduction zones and 61 megathrust earthquakes.
eartharxiv.org/repository/v...
October 7, 2025 at 7:01 PM
Do Coupled Megathrusts Rupture?
In our new preprint, Bar Oryan and I present
the first global analysis of the relationship between kinematic geodetic coupling and earthquake slip models across 12 subduction zones and 61 megathrust earthquakes.
eartharxiv.org/repository/v...
In our new preprint, Bar Oryan and I present
the first global analysis of the relationship between kinematic geodetic coupling and earthquake slip models across 12 subduction zones and 61 megathrust earthquakes.
eartharxiv.org/repository/v...
Reposted by Sajjad Ahmadi
****Reminder to register to attend the InSAR Training Workshop - deadline Friday 10th October.****
It will be held both in-person and online at the University of Leeds from 11-13 November, 2025.
The registration link and more information are available at:
comet.nerc.ac.uk/comet-insar-...
It will be held both in-person and online at the University of Leeds from 11-13 November, 2025.
The registration link and more information are available at:
comet.nerc.ac.uk/comet-insar-...
October 7, 2025 at 2:45 PM
****Reminder to register to attend the InSAR Training Workshop - deadline Friday 10th October.****
It will be held both in-person and online at the University of Leeds from 11-13 November, 2025.
The registration link and more information are available at:
comet.nerc.ac.uk/comet-insar-...
It will be held both in-person and online at the University of Leeds from 11-13 November, 2025.
The registration link and more information are available at:
comet.nerc.ac.uk/comet-insar-...
Reposted by Sajjad Ahmadi
New paper alert. Volcanic crisis reveals coupled magma system at Santorini and Kolumbo. Great work led by Marius and Jens, thanks all for working on that together! It can be found in today’s issue of Nature.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
September 24, 2025 at 4:58 PM
New paper alert. Volcanic crisis reveals coupled magma system at Santorini and Kolumbo. Great work led by Marius and Jens, thanks all for working on that together! It can be found in today’s issue of Nature.
www.nature.com/articles/s41...
www.nature.com/articles/s41...
Reposted by Sajjad Ahmadi
#EarthquakeReport for the M 8.8 #Earthquake offshore of #Kamchatka #Russia
megathrust subduction zone earthquake
transpacific #Tsunam
report is prepared
some tide gage plots put together
i will update over the coming week
report here: earthjay.com/?p=12355
megathrust subduction zone earthquake
transpacific #Tsunam
report is prepared
some tide gage plots put together
i will update over the coming week
report here: earthjay.com/?p=12355
August 3, 2025 at 11:06 PM
#EarthquakeReport for the M 8.8 #Earthquake offshore of #Kamchatka #Russia
megathrust subduction zone earthquake
transpacific #Tsunam
report is prepared
some tide gage plots put together
i will update over the coming week
report here: earthjay.com/?p=12355
megathrust subduction zone earthquake
transpacific #Tsunam
report is prepared
some tide gage plots put together
i will update over the coming week
report here: earthjay.com/?p=12355
Reposted by Sajjad Ahmadi
More NISAR launch coverage and info about the launch itself this Wednesday
www.nasa.gov/news-release...
www.nasa.gov/news-release...
NASA Sets Launch Coverage for Earth-Tracking NISAR Satellite - NASA
NASA will provide live coverage of launch activities for NISAR (NASA-ISRO Synthetic Aperture Radar), which is set to lift off at 8:10 a.m. EDT (5:40 p.m.
www.nasa.gov
July 28, 2025 at 12:03 PM
More NISAR launch coverage and info about the launch itself this Wednesday
www.nasa.gov/news-release...
www.nasa.gov/news-release...
Reposted by Sajjad Ahmadi
A digital twin for Cascadia tsunami early warning: We present real-time Bayesian inference of seafloor motion at extreme scale ~1 billion parameters, using 3D coupled acoustic-gravity wave equations & El Capitan's 43,520 #GPUs.
Preprint led by Stefan Henneking & Omar Ghattas
arxiv.org/abs/2504.16344
Preprint led by Stefan Henneking & Omar Ghattas
arxiv.org/abs/2504.16344
May 10, 2025 at 12:43 AM
A digital twin for Cascadia tsunami early warning: We present real-time Bayesian inference of seafloor motion at extreme scale ~1 billion parameters, using 3D coupled acoustic-gravity wave equations & El Capitan's 43,520 #GPUs.
Preprint led by Stefan Henneking & Omar Ghattas
arxiv.org/abs/2504.16344
Preprint led by Stefan Henneking & Omar Ghattas
arxiv.org/abs/2504.16344
Reposted by Sajjad Ahmadi
Temblor's one-month forecast following Myanmar's devastating magnitude 7.7 earthquake is now available.
temblor.net/earthquake-i...
temblor.net/earthquake-i...
One-month earthquake forecast for western Myanmar following the devastating magnitude 7.7 Mandalay shock - Temblor.net
Our short-term forecast suggests that between now and May 1, between 1 and 4 shocks greater than or equal to magnitude 4.0 are expected — fortunately a low rate. Much ...
temblor.net
April 4, 2025 at 4:24 PM
Temblor's one-month forecast following Myanmar's devastating magnitude 7.7 earthquake is now available.
temblor.net/earthquake-i...
temblor.net/earthquake-i...
Reposted by Sajjad Ahmadi
Sentinel-1C(!) acquired new SAR data over Myanmar yesterday. Here are the azimuth and range offsets. Not particularly unexpected (right-lateral slip, 400 km+ long rupture), given earlier InSAR/image offset results, but surprisingly clean, given S1C is not out of its commissioning phase.
April 4, 2025 at 7:49 AM
Sentinel-1C(!) acquired new SAR data over Myanmar yesterday. Here are the azimuth and range offsets. Not particularly unexpected (right-lateral slip, 400 km+ long rupture), given earlier InSAR/image offset results, but surprisingly clean, given S1C is not out of its commissioning phase.
Reposted by Sajjad Ahmadi
First slip map for the Mw 7.8 Myanmar earthquake. Propagation of rupture towards the South. Slipnear method (Géoazur/OCA).
March 28, 2025 at 8:17 AM
First slip map for the Mw 7.8 Myanmar earthquake. Propagation of rupture towards the South. Slipnear method (Géoazur/OCA).
Reposted by Sajjad Ahmadi
*** NEW PAPER ALERT ***
Led by Dr. Barnard of @USGS & published in @NatureClimate. In collaboration with @EOI_lab of @VT_Science and several universities, we show that a 1m rise #SL by 2100 will affect over 14M people and $1T property along SE #Atlantic coast.
Pub: www.nature.com/articles/s41...
Led by Dr. Barnard of @USGS & published in @NatureClimate. In collaboration with @EOI_lab of @VT_Science and several universities, we show that a 1m rise #SL by 2100 will affect over 14M people and $1T property along SE #Atlantic coast.
Pub: www.nature.com/articles/s41...
November 21, 2024 at 4:35 PM
*** NEW PAPER ALERT ***
Led by Dr. Barnard of @USGS & published in @NatureClimate. In collaboration with @EOI_lab of @VT_Science and several universities, we show that a 1m rise #SL by 2100 will affect over 14M people and $1T property along SE #Atlantic coast.
Pub: www.nature.com/articles/s41...
Led by Dr. Barnard of @USGS & published in @NatureClimate. In collaboration with @EOI_lab of @VT_Science and several universities, we show that a 1m rise #SL by 2100 will affect over 14M people and $1T property along SE #Atlantic coast.
Pub: www.nature.com/articles/s41...
Reposted by Sajjad Ahmadi
6 April 1977 13:37 UT
M5.9 earthquake hit Naghan, Chaharmahal and Bakhtiari prov., Zagros Mountains, southwestern Iran, destroying 2100 houses (most adobe-brick constructions) and killing 366 people.
earthquake.usgs.gov/earthquakes/...
annalsofgeophysics.eu/index.php/an...
nyshistoricnewspapers.org
M5.9 earthquake hit Naghan, Chaharmahal and Bakhtiari prov., Zagros Mountains, southwestern Iran, destroying 2100 houses (most adobe-brick constructions) and killing 366 people.
earthquake.usgs.gov/earthquakes/...
annalsofgeophysics.eu/index.php/an...
nyshistoricnewspapers.org
April 6, 2024 at 9:59 AM
6 April 1977 13:37 UT
M5.9 earthquake hit Naghan, Chaharmahal and Bakhtiari prov., Zagros Mountains, southwestern Iran, destroying 2100 houses (most adobe-brick constructions) and killing 366 people.
earthquake.usgs.gov/earthquakes/...
annalsofgeophysics.eu/index.php/an...
nyshistoricnewspapers.org
M5.9 earthquake hit Naghan, Chaharmahal and Bakhtiari prov., Zagros Mountains, southwestern Iran, destroying 2100 houses (most adobe-brick constructions) and killing 366 people.
earthquake.usgs.gov/earthquakes/...
annalsofgeophysics.eu/index.php/an...
nyshistoricnewspapers.org
Reposted by Sajjad Ahmadi
Rapid 3D dynamic rupture simulation of the M7.4 #Taiwan #earthquake based on the USGS finite fault model: dynamic rupture propagation to the NE, aligned with aftershocks, max. slip 1.6 m, local rupture complexity.
Using a workflow by T. Ulrich et al.
meetingorganizer.copernicus.org/EGU24/EGU24-...
Using a workflow by T. Ulrich et al.
meetingorganizer.copernicus.org/EGU24/EGU24-...
April 3, 2024 at 7:16 PM
Rapid 3D dynamic rupture simulation of the M7.4 #Taiwan #earthquake based on the USGS finite fault model: dynamic rupture propagation to the NE, aligned with aftershocks, max. slip 1.6 m, local rupture complexity.
Using a workflow by T. Ulrich et al.
meetingorganizer.copernicus.org/EGU24/EGU24-...
Using a workflow by T. Ulrich et al.
meetingorganizer.copernicus.org/EGU24/EGU24-...
Reposted by Sajjad Ahmadi
Unusual earthquake series in Canada: induced or of natural origin? A study by Hannes Vasyura-Bathke & Torsten Dahm from GFZ & colleagues from Canada, confirms the suspicion that the quakes were triggered by industrial wastewater disposal which started 10 years ago. www.gfz-potsdam.de/en/press/new...
Induced or natural? New insights into an unusual earthquake series in Canada
Study shows that the continuous discharge of industrial wastewater can trigger earthquakes in fault zones even after 10 years
www.gfz-potsdam.de
March 13, 2024 at 4:58 PM
Unusual earthquake series in Canada: induced or of natural origin? A study by Hannes Vasyura-Bathke & Torsten Dahm from GFZ & colleagues from Canada, confirms the suspicion that the quakes were triggered by industrial wastewater disposal which started 10 years ago. www.gfz-potsdam.de/en/press/new...
Reposted by Sajjad Ahmadi
Yay, our paper is out! :)
🚨New paper alert!🚨
So happy that this work with @leilamizrahi.bsky.social is finally out!
Ee pseudo-prospectively test different flavours of ETAS and seismogenic index on the Hengill field in Iceland.
Read it open access (thanks to the @ethzurich.bsky.social Library): doi.org/10.1029/2023...
So happy that this work with @leilamizrahi.bsky.social is finally out!
Ee pseudo-prospectively test different flavours of ETAS and seismogenic index on the Hengill field in Iceland.
Read it open access (thanks to the @ethzurich.bsky.social Library): doi.org/10.1029/2023...
March 6, 2024 at 4:31 PM
Yay, our paper is out! :)