John Cassidy (@earthquakeguy) 's Twitter Profile
John Cassidy

@earthquakeguy

NRCan earthquake seismologist + UVic Prof. Works with engineers, emergency managers, and communities to minimize the impact of #earthquakes. My thoughts/tweets.

ID: 80607933

linkhttps://www.researchgate.net/profile/John_Cassidy6 calendar_today07-10-2009 15:52:41

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John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Are you looking for the latest updates on the tsunami from the M8.8 Kamchatka earthquake? See: tsunami.gov and check with your local emergency preparedness group. As of 6:20 a.m. PT, July 30 the tsunami advisory for the coast of British Columbia has been cancelled.

Are you looking for the latest updates on the tsunami from the M8.8 Kamchatka earthquake?  See: tsunami.gov and check with your local emergency preparedness group. As of 6:20 a.m. PT, July 30 the tsunami advisory for the coast of British Columbia has been cancelled.
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Did you feel shaking on Haida Gwaii today at 06:20 a.m.? That was a M4 #earthquake located 45 km WSW of Daajing Giids. It was mildly felt - no damage. Details: earthquakescanada.nrcan.gc.ca/recent/2025/20… Please report shaking here: earthquakescanada.nrcan.gc.ca/dyfi-lavr/form…

Did you feel shaking on Haida Gwaii today at 06:20 a.m.? That was a M4 #earthquake located 45 km WSW of Daajing Giids. It was mildly felt - no damage.
Details: earthquakescanada.nrcan.gc.ca/recent/2025/20…
Please report shaking here:
earthquakescanada.nrcan.gc.ca/dyfi-lavr/form…
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Wow... we have lived here for 22 years but I have never seen a peacock standing on the roof of a car in our driveway before... ???

Wow... we have lived here for 22 years but I have never seen a peacock standing on the roof of a car in our driveway before... ???
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Thanks, Saanich Emergency Program - I am looking forward to this! If you are in Saanich / southern Vancouver Island and interested in earthquakes, tsunamis, earthquake science and preparedness - register today and bring your questions! saanich.ca/EN/main/news-e…

John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Did you feel shaking on Monday evening at 7:17 p.m. on southern Vancouver Island? 100's did. That was a M3.6 earthquake ~18 km SE of Port Renfrew (70 km W of Victoria). No damage and only light shaking (thanks to the 36 km depth). Details/report shaking: earthquakescanada.nrcan.gc.ca/recent/2025/20…

Did you feel shaking on Monday evening at 7:17 p.m. on southern Vancouver Island? 100's did. That was a M3.6 earthquake ~18 km SE of Port Renfrew (70 km W of Victoria). No damage and only light shaking (thanks to the 36 km depth). 
Details/report shaking: 
earthquakescanada.nrcan.gc.ca/recent/2025/20…
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

August 21, 1949 - a damaging M8.1 #earthquake (one of the largest ever recorded in North America) struck off Haida Gwaii. Shaking was so strong that it was hard to stand. Felt across most of British Columbia, parts of Alberta, WA, Yukon and Alaska earthquakescanada.nrcan.gc.ca/historic-histo…

August 21, 1949 - a damaging M8.1 #earthquake (one of the largest ever recorded in North America) struck off Haida Gwaii. Shaking was so strong that it was hard to stand. Felt across most of British Columbia, parts of Alberta, WA, Yukon and Alaska earthquakescanada.nrcan.gc.ca/historic-histo…
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

76 years ago tonight - a M8.1 earthquake off Haida Gwaii ruptured a 500-km-long segment of the Queen Charlotte Fault (Canada's "San Andreas Fault"). The average slip along the fault was ~5 m. Strong shaking made it hard to stand and 100+ aftershocks were felt on Haida Gwaii.

76 years ago tonight - a M8.1  earthquake off  Haida Gwaii ruptured a 500-km-long segment of the Queen Charlotte Fault (Canada's "San Andreas Fault"). The average slip along the fault was ~5 m. Strong shaking made it hard to stand and 100+ aftershocks were felt on Haida Gwaii.
Jason "Jay" R. Patton (@patton_cascadia) 's Twitter Profile Photo

#EarthquakeReport for M7.5 #Earthquake #Sismo #Terremoto offshore of #Chile #Argentina #Antarctica en #DrakesPassage Strike-slip earthquake mechanism Probably related to May '24 M7.4 sequence (?) '24 M7.4 report: earthjay.com/?p=12297 earthquake.usgs.gov/earthquakes/ev…

#EarthquakeReport for M7.5 #Earthquake #Sismo #Terremoto offshore of #Chile #Argentina #Antarctica en #DrakesPassage

Strike-slip earthquake mechanism
Probably related to May '24 M7.4 sequence (?)

'24 M7.4 report:
earthjay.com/?p=12297

earthquake.usgs.gov/earthquakes/ev…
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Welcome to September - when my Vancouver Island lemon tree still has lots of ripe lemons from this past Spring but also has lots of new lemons that will be ready to pick in 2026!

Welcome to September - when my Vancouver Island lemon tree still has lots of ripe lemons from this past Spring but also has lots of new lemons that will be ready to pick in 2026!
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

127 years of recording large, global earthquakes in Victoria, Canada! On September 3, 1898, a Milne seismograph began operation in the basement of the old Customs House building on the Victoria waterfront. It was one of the first seismographs in Canada: science.gc.ca/site/science/e…

127 years of recording large, global earthquakes in Victoria, Canada! 
On September 3, 1898, a Milne seismograph began operation in the basement of the old Customs House building on the Victoria waterfront. It was one of the first seismographs in Canada:
science.gc.ca/site/science/e…
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

September 5, 1944: A damaging M5.8 earthquake struck near Cornwall, ON and Massena, NY. Chimneys came crashing down and many masonry structures were damaged. Felt from Quebec City to Boston to New York City to Toronto. Details: earthquakescanada.nrcan.gc.ca/historic-histo… adsabs.harvard.edu/full/1945JRASC…

September 5, 1944:  A damaging M5.8 earthquake struck near Cornwall, ON and Massena, NY. Chimneys came crashing down and many masonry structures were damaged. Felt from Quebec City to Boston to New York City to Toronto.  
Details:  earthquakescanada.nrcan.gc.ca/historic-histo…
adsabs.harvard.edu/full/1945JRASC…
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

At 8:00 a.m. PDT today, a M4.8 earthquake occurred in Canada's most seismically active region - offshore between Haida Gwaii and Vancouver Island. No damage or tsunami expected. Details and to report felt shaking: earthquakescanada.nrcan.gc.ca/recent/2025/20… Tectonics: earthquakescanada.nrcan.gc.ca/pprs-pprp/pubs…

At 8:00 a.m. PDT today, a M4.8 earthquake occurred in Canada's most seismically active region - offshore between Haida Gwaii and Vancouver Island. No damage or tsunami expected.
Details and to report felt shaking:
earthquakescanada.nrcan.gc.ca/recent/2025/20…
Tectonics: earthquakescanada.nrcan.gc.ca/pprs-pprp/pubs…
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Did you feel a slight shake east of Vancouver at 9:28 last night? That was a small M2.6 earthquake located 33 km NW of Abbotsford, and felt by many in the area. earthquakescanada.nrcan.gc.ca/recent/2025/20… A tiny reminder of an active earthquake zone, and to register for the ShakeOut BC exercise.

Did you feel a slight shake east of Vancouver at 9:28 last night? That was a small M2.6 earthquake located 33 km NW of Abbotsford, and felt by many in the area.
earthquakescanada.nrcan.gc.ca/recent/2025/20…
A tiny reminder of an active earthquake zone, and to register for the <a href="/ShakeOutBC/">ShakeOut BC</a> exercise.
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Did you feel shaking on Haida Gwaii at 1:45 p.m. today (September 15)? That was a M4.2 earthquake located off the west coast, 75 km west of Daajing Giids. Details and report shaking: earthquakescanada.nrcan.gc.ca/recent/2025/20… This is not an unusual event for this region. No impacts expected.

Did you feel shaking on Haida Gwaii at 1:45 p.m. today (September 15)? That was a M4.2 earthquake located off the west coast, 75 km west of Daajing Giids. Details and report shaking: 
earthquakescanada.nrcan.gc.ca/recent/2025/20…
This is not an unusual event for this region. No impacts expected.
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Did you feel shaking on southern Vancouver Island at 5 a.m. today? That was a M3.0 earthquake located 16 km SW of Duncan and 40 km WNW of Victoria. Lightly felt across the region. Details and to report shaking: earthquakescanada.nrcan.gc.ca/recent/2025/20…

Did you feel shaking on southern Vancouver Island at 5 a.m. today?
That was a M3.0 earthquake located 16 km SW of Duncan and 40 km WNW of Victoria. Lightly felt across the region.
Details and to report shaking:
earthquakescanada.nrcan.gc.ca/recent/2025/20…
Emergency Info BC (@emergencyinfobc) 's Twitter Profile Photo

Officials are assessing data for tsunami risk to #BC following an M7.8 earthquake 255 miles (410 km) southwest of Bering Island, Russia. Stand by for BC-specific info. Follow NWS Tsunami Alerts for updates. More info: emergencyinfobc.gov.bc.ca/event/tsunami-…

John Cassidy (@earthquakeguy) 's Twitter Profile Photo

For my friends in Washington, Oregon and northern California - a great summary of earthquake hazards and probabilities for the three types of earthquakes in Cascadia has been released by the USGS: pubs.usgs.gov/publication/fs… - note, this also applies to southwest British Columbia.

John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Wow, it is almost autumn... But first, just enjoying the last day of summer, sitting out on the deck enjoying amazing, fresh-picked local strawberries, and reading this fantastic book written by a local author! Thanks, 🇨🇦 Jean Paetkau 📕 ! #VancouverIsland

Wow, it is almost autumn...
But first, just enjoying the last day of summer, sitting out on the deck enjoying amazing, fresh-picked local strawberries, and reading this fantastic book written by a local author! Thanks, <a href="/snufflewort/">🇨🇦 Jean Paetkau 📕</a> !
#VancouverIsland
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Not a bad view for brunch... four yachts and, further back, three cruise ships, including the Norwegian Joy and the Royal Princess bringing about 8000 visitors to our island in the Pacific... #VancouverIsland

Not a bad view for brunch... four yachts and, further back, three cruise ships, including the Norwegian Joy and the Royal Princess bringing about 8000 visitors to our island in the Pacific...
#VancouverIsland
John Cassidy (@earthquakeguy) 's Twitter Profile Photo

Oh Winston, our hearts are broken. We are so grateful for the 15+ years that you spent with us. Thank you for the many 1000's of walks and hikes. Thank you for always being there and for always watching out the window for our return then greeting us at the door. Miss you forever.

Oh Winston, our hearts are broken. We are so grateful for the 15+ years that you spent with us. Thank you for the many 1000's of walks and hikes. Thank you for always being there and for always watching out the window for our return then greeting us at the door. Miss you forever.