Helen Janiszewski
@hajanisz.bsky.social
seismologist. earthquakes. volcanoes. subduction. science. dinosaurs 🦖.
assistant professor at UH Mānoa.
assistant professor at UH Mānoa.
Reposted by Helen Janiszewski
The underwater seismometer network is so great, as evidenced from yesterday's EQ off-Tohoku.
Reposting unofficial visualization by x.com/kotoho76/sta...
Reposting unofficial visualization by x.com/kotoho76/sta...
November 10, 2025 at 6:56 AM
The underwater seismometer network is so great, as evidenced from yesterday's EQ off-Tohoku.
Reposting unofficial visualization by x.com/kotoho76/sta...
Reposting unofficial visualization by x.com/kotoho76/sta...
Reposted by Helen Janiszewski
Quoted supporting our counterparts and friends at the Alaska Earthquake Center. The cost of the U.S. tsunami warning and mitigation effort is really a pittance. None of it has ever been adequately funded in any administration, and now things are worse. ⚒️ www.nbcnews.com/science/tsun...
U.S. tsunami warning system, reeling from funding and staffing cuts, is dealt another blow
Seismic monitoring stations in Alaska are closing after a denied federal grant, risking delayed tsunami warnings for people living on the West Coast.
www.nbcnews.com
November 9, 2025 at 7:03 PM
Quoted supporting our counterparts and friends at the Alaska Earthquake Center. The cost of the U.S. tsunami warning and mitigation effort is really a pittance. None of it has ever been adequately funded in any administration, and now things are worse. ⚒️ www.nbcnews.com/science/tsun...
Reposted by Helen Janiszewski
NOAA’s National Weather Service holds the federal responsibility for tsunami warnings, and has historically been a primary supporter of seismic data collection in Alaska
NOAA cancels longstanding funding for seismic data collection crucial to tsunami warning systems
The Alaska Earthquake Center has long provided NOAA with seismic data for tsunami monitoring and warning purposes. That work will wind down in November, after the federal agency said it can no longer fund the contract.
akpub.io
November 1, 2025 at 2:50 AM
NOAA’s National Weather Service holds the federal responsibility for tsunami warnings, and has historically been a primary supporter of seismic data collection in Alaska
Josh beat me to this, but yes, we have a new paper out on how noise variability affects ambient noise imaging on ocean bottom seismic arrays. So much time spent nerding out over OBS! But it was worth it for a couple of interesting findings.
Super proud of this paper w @hajanisz.bsky.social that went live a couple weeks ago!
The culmination of countless Zoom meetings (ok, often happy hours, beer in hand) nerding out on OBS data. Some of the most fun I've had on a paper. Yes, there'll be more...
pubs.geoscienceworld.org/ssa/srl/arti...
The culmination of countless Zoom meetings (ok, often happy hours, beer in hand) nerding out on OBS data. Some of the most fun I've had on a paper. Yes, there'll be more...
pubs.geoscienceworld.org/ssa/srl/arti...
Ambient Noise Analyses at Broadband Ocean‐Bottom Seismometers: Data Quality and Transfer Function Corrections | Seismological Research Letters | GeoScienceWorld
Abstract. Seismic ambient noise tomography has revolutionized regional crustal and upper‐mantle imaging for broadband ocean‐bottom seismometer (BBOBS)
pubs.geoscienceworld.org
October 7, 2025 at 11:02 PM
Josh beat me to this, but yes, we have a new paper out on how noise variability affects ambient noise imaging on ocean bottom seismic arrays. So much time spent nerding out over OBS! But it was worth it for a couple of interesting findings.
Reposted by Helen Janiszewski
📢🌊 Funded PhD position in Marine Seismology at Syracuse University 🌊📢
I'm seeking an enthusiastic student to join our Seismology group at SU! You'll be part of a collaborative NSF-funded team to collect new marine seismic data to work out the tectonics of early seafloor spreading in the Atlantic.
I'm seeking an enthusiastic student to join our Seismology group at SU! You'll be part of a collaborative NSF-funded team to collect new marine seismic data to work out the tectonics of early seafloor spreading in the Atlantic.
October 6, 2025 at 10:44 PM
📢🌊 Funded PhD position in Marine Seismology at Syracuse University 🌊📢
I'm seeking an enthusiastic student to join our Seismology group at SU! You'll be part of a collaborative NSF-funded team to collect new marine seismic data to work out the tectonics of early seafloor spreading in the Atlantic.
I'm seeking an enthusiastic student to join our Seismology group at SU! You'll be part of a collaborative NSF-funded team to collect new marine seismic data to work out the tectonics of early seafloor spreading in the Atlantic.
Reposted by Helen Janiszewski
The Alaska Division of Geological & Geophysical Surveys is hiring a volcanologist who would work with the Alaska Volcano Observatory. A fantastic opportunity to work with great people and study very active volcanoes. Details in link below. Applications close on Oct. 1. ⚒️🌋🧪 bit.ly/3IkqN9n
Job Bulletin
www.governmentjobs.com
September 12, 2025 at 7:56 PM
The Alaska Division of Geological & Geophysical Surveys is hiring a volcanologist who would work with the Alaska Volcano Observatory. A fantastic opportunity to work with great people and study very active volcanoes. Details in link below. Applications close on Oct. 1. ⚒️🌋🧪 bit.ly/3IkqN9n
Reposted by Helen Janiszewski
📣 SAVE THE DATE
Mark your calendars for the SZ4D Science Community Meeting in Long Beach, CA, April 20-22, 2026, preceded by an early career event. Full program, registration, travel grant applications available in the Fall. Open to all. More info -> www.sz4d.org/events/2026-...
Mark your calendars for the SZ4D Science Community Meeting in Long Beach, CA, April 20-22, 2026, preceded by an early career event. Full program, registration, travel grant applications available in the Fall. Open to all. More info -> www.sz4d.org/events/2026-...
August 26, 2025 at 8:55 PM
📣 SAVE THE DATE
Mark your calendars for the SZ4D Science Community Meeting in Long Beach, CA, April 20-22, 2026, preceded by an early career event. Full program, registration, travel grant applications available in the Fall. Open to all. More info -> www.sz4d.org/events/2026-...
Mark your calendars for the SZ4D Science Community Meeting in Long Beach, CA, April 20-22, 2026, preceded by an early career event. Full program, registration, travel grant applications available in the Fall. Open to all. More info -> www.sz4d.org/events/2026-...
Reposted by Helen Janiszewski
Here is @noaa.gov's model of the tsunami propagation from the people at PMEL, initiated with the earthquake location and then calibrated by the DART buoy observations. There is a wealth of great information at their website (link in thread). (1/6) ⚒️ www.youtube.com/watch?v=oOtJ...
Kamchatka Tsunami, July 29, 2025 tsunami propagation
YouTube video by NOAAPMEL
www.youtube.com
August 2, 2025 at 5:15 PM
Here is @noaa.gov's model of the tsunami propagation from the people at PMEL, initiated with the earthquake location and then calibrated by the DART buoy observations. There is a wealth of great information at their website (link in thread). (1/6) ⚒️ www.youtube.com/watch?v=oOtJ...
Nice article about the tsunami response here in Hawaiʻi earlier this week. While this time the waves and impacts were minimal, it’s a reminder that isn’t always the case and we won’t always have that much time. An Aleutian earthquake can generate a tsunami that reaches Hawaiʻi in ~4.5-5 hrs.
August 1, 2025 at 5:18 PM
Nice article about the tsunami response here in Hawaiʻi earlier this week. While this time the waves and impacts were minimal, it’s a reminder that isn’t always the case and we won’t always have that much time. An Aleutian earthquake can generate a tsunami that reaches Hawaiʻi in ~4.5-5 hrs.
Reposted by Helen Janiszewski
After a 25-hour workday, I'm finally home from this #tsunami response! I have many thoughts to share soon, but most of them come down to "hey, maybe we shouldn't defund the National Tsunami Hazard Mitigation Program, which funds the vast majority of state-level tsunami work in the US!"
The #tsunami advisory for #WaState has been CANCELLED. At this time there is no tsunami threat to the Washington coast. Check out www.tsunami.gov for more information. #TsunamiAdvisory #WaWX
July 30, 2025 at 7:50 PM
After a 25-hour workday, I'm finally home from this #tsunami response! I have many thoughts to share soon, but most of them come down to "hey, maybe we shouldn't defund the National Tsunami Hazard Mitigation Program, which funds the vast majority of state-level tsunami work in the US!"
Tsunami / water level gauge experts. Any idea what this late peak at Midway is? Glitch or something real?
July 30, 2025 at 8:55 PM
Tsunami / water level gauge experts. Any idea what this late peak at Midway is? Glitch or something real?
Reposted by Helen Janiszewski
Another earthquake story from @sciam.bsky.social by the always-excellent @squigglyvolcano.bsky.social explaining why the tsunami from the Russia quake wasn't as huge as the one from the 2011 Japan quake, for example. 🧪
Why the Russia Earthquake Didn't Cause a Huge Tsunami
Russia's magnitude-8.8 earthquake spawned serious tsunami warnings, but waves have been moderate so far. Here's the geological reason why
www.scientificamerican.com
July 30, 2025 at 4:07 PM
Another earthquake story from @sciam.bsky.social by the always-excellent @squigglyvolcano.bsky.social explaining why the tsunami from the Russia quake wasn't as huge as the one from the 2011 Japan quake, for example. 🧪
Reposted by Helen Janiszewski
Fresh from the press, so to speak, a result of our #tsunami model based on the specifics of this earthquake (we will update it one we have more model runs). The color code is wave height in metres. The dotted line in the centre of the picture is the Hawaiian island chain.
July 30, 2025 at 3:44 PM
Fresh from the press, so to speak, a result of our #tsunami model based on the specifics of this earthquake (we will update it one we have more model runs). The color code is wave height in metres. The dotted line in the centre of the picture is the Hawaiian island chain.
Reposted by Helen Janiszewski
Another quick comparison of the 1952 #Kamchatka #earthquake from MacInnes et al. (2010) with today’s M8.8 event. The aftershock areas are similar, as well as one region of foreshocks. The updated USGS rupture model has a max slip of 10m versus 12m for 1952, with SW rupture direction. 🧪⚒️
July 30, 2025 at 12:37 PM
Another quick comparison of the 1952 #Kamchatka #earthquake from MacInnes et al. (2010) with today’s M8.8 event. The aftershock areas are similar, as well as one region of foreshocks. The updated USGS rupture model has a max slip of 10m versus 12m for 1952, with SW rupture direction. 🧪⚒️
Keeping an eye on water levels as the tsunami waves hit Hawaii (bottom row) while the waves are still hitting Midway (top right). Good reminder why we won’t be in the clear for a while.
July 30, 2025 at 6:56 AM
Keeping an eye on water levels as the tsunami waves hit Hawaii (bottom row) while the waves are still hitting Midway (top right). Good reminder why we won’t be in the clear for a while.
Reposted by Helen Janiszewski
On X, Masaki Nobushiro posts a recurring (and useful) drawing about how people wrongly think a 1m tsunami is a cresting wave when it's actually a wall of water filled with dangerous and deadly debris that's strong enough to sweep up a car.
#tsunami
#tsunami
July 30, 2025 at 3:29 AM
On X, Masaki Nobushiro posts a recurring (and useful) drawing about how people wrongly think a 1m tsunami is a cresting wave when it's actually a wall of water filled with dangerous and deadly debris that's strong enough to sweep up a car.
#tsunami
#tsunami
Tsunami watch for the Kamchatka earthquake includes Hawaii.
#Earthquake
M8.7 earthquake OFF THE EAST COAST OF KAMCHATKA RUSSIA 16:24PDT Jul 29 Depth 74km: Tsunami possible
- Event details: Preliminary magnitude 8.7 (Mwp) earthquake / Lat: 52.209, Lon: 159.979 at 2025-07-29T23:24:52Z
M8.7 earthquake OFF THE EAST COAST OF KAMCHATKA RUSSIA 16:24PDT Jul 29 Depth 74km: Tsunami possible
- Event details: Preliminary magnitude 8.7 (Mwp) earthquake / Lat: 52.209, Lon: 159.979 at 2025-07-29T23:24:52Z
July 30, 2025 at 12:38 AM
Tsunami watch for the Kamchatka earthquake includes Hawaii.
Reposted by Helen Janiszewski
Updated to a M8.7
July 30, 2025 at 12:26 AM
Updated to a M8.7
Reposted by Helen Janiszewski
Tsunami warning issued for parts of Alaska. Visit www.tsunami.gov for more information
July 16, 2025 at 9:00 PM
Tsunami warning issued for parts of Alaska. Visit www.tsunami.gov for more information
Reposted by Helen Janiszewski
#EarthquakeReport for M7.3 #Earthquake offshore of #SandPoint #Alaska
Right-lateral (?) Strike-slip earthquake mechanism
within subducting Pacific plate
Maybe small local #Tsunami (?)
Earthquake in similar location in 2023 earthjay.com?p=11714
earthquake.usgs.gov/earthquakes/...
Right-lateral (?) Strike-slip earthquake mechanism
within subducting Pacific plate
Maybe small local #Tsunami (?)
Earthquake in similar location in 2023 earthjay.com?p=11714
earthquake.usgs.gov/earthquakes/...
July 16, 2025 at 9:03 PM
#EarthquakeReport for M7.3 #Earthquake offshore of #SandPoint #Alaska
Right-lateral (?) Strike-slip earthquake mechanism
within subducting Pacific plate
Maybe small local #Tsunami (?)
Earthquake in similar location in 2023 earthjay.com?p=11714
earthquake.usgs.gov/earthquakes/...
Right-lateral (?) Strike-slip earthquake mechanism
within subducting Pacific plate
Maybe small local #Tsunami (?)
Earthquake in similar location in 2023 earthjay.com?p=11714
earthquake.usgs.gov/earthquakes/...
Reposted by Helen Janiszewski
In the next few months, Japan will finish work on an instrumented network of seafloor cables and wire it directly into a national early warning system.
Learn more: scim.ag/44FXkxI
Learn more: scim.ag/44FXkxI
July 10, 2025 at 4:21 PM
In the next few months, Japan will finish work on an instrumented network of seafloor cables and wire it directly into a national early warning system.
Learn more: scim.ag/44FXkxI
Learn more: scim.ag/44FXkxI
Reposted by Helen Janiszewski
The National Science Foundation has lost its 8-year-old headquarters building to another federal agency as part of President Donald Trump’s campaign to shrink the size of the U.S. government. scim.ag/3HYXNUk
In latest blow, National Science Foundation staff to be booted from their headquarters
Trump administration is giving building to housing department but has not said where science agency will go
scim.ag
June 26, 2025 at 12:52 PM
The National Science Foundation has lost its 8-year-old headquarters building to another federal agency as part of President Donald Trump’s campaign to shrink the size of the U.S. government. scim.ag/3HYXNUk
Reposted by Helen Janiszewski
June 25, 2025 at 12:55 AM
Reposted by Helen Janiszewski
US Earth Scientists: We know you have questions, come get them answered directly from NSF/EAR POs! Tuesday, June 17, 2p Eastern. Register here: www.nsf.gov/events/nsf-d...
NSF Division of Earth Sciences Informational Webinar
www.nsf.gov
June 9, 2025 at 7:24 PM
US Earth Scientists: We know you have questions, come get them answered directly from NSF/EAR POs! Tuesday, June 17, 2p Eastern. Register here: www.nsf.gov/events/nsf-d...