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Hosts Linda and Sequoya explore the catastrophic 1980 eruption of Mount St. Helens through the contrasting stories of two men: 83-year-old lodge owner Harry R. Truman, who stubbornly refused evacuation despite repeated warnings, and 30-year-old volcanologist David A. Johnston, whose final radio transmission—"Vancouver! Vancouver! This is it!"—immortalized his ultimate sacrifice for public safety. Through vivid storytelling, the podcast chronicles the dramatic sequence of events from the first warning signs to the fateful morning of May 18, 1980, when a magnitude 5.1 earthquake triggered history's largest recorded landslide and an unexpected lateral blast. Truman, paradoxically both dismissive of the danger and accepting of his fate, chose to remain with the mountain that had shaped his identity. Johnston, though positioned at what was considered a safe observation distance, tragically found himself directly in the eruption's path. Beyond these personal stories, the episode captures remarkable survivor accounts, details the eruption's devastating economic consequences, and explores how this disaster fundamentally changed our scientific understanding of volcanic hazards and revolutionized monitoring approaches worldwide. ⏱️ Timestamps
INTRODUCTION:
00:00 – Welcome
01:50 – Why we made this episode
HISTORICAL CONTEXT:
02:50 – “Mount Fuji of the Pacific Northwest”
04:00 – Mount St. Helens Wakes Up
THE TWO MEN
06:40 – Meet Harry R. Truman
08:30 –Truman Refuses to Evacuate
11:20 – Meet David A. Johnston
12:15 – Johnston’s Bravery
13:00 – Red Zone Established
MAY 18, 1980 ERUPTION SEQUENCE
13:45 – Earthquake, Landslide, Lateral Blast
15:35 – Johnston’s Last Radio Transmission
16:00 – Truman’s Fate
16:35 – Gerry Martin’s Radio Transmission
17:20 – Photos of Landslide and Lateral Blast
19:00 – Plinian Eruption
19:50 – Lahars
AFTERMATH & IMPACT
21:05 – Economic Impact
21:30 – Advances in Scientific Understanding
22:10 – Public Safety Lessons
CLOSING
23:20 – Closing Thoughts
24:25 – What’s Next
📚 Learn More
▶️ Mount St. Helens – Full Playlist on YouTube
https://www.youtube.com/playlist?list=PLO683wv5Jx1EmLc_-N7vTUyw8mtNJNgJP
▶️ Gary Rosenquist Sequence – AI Animated
https://www.youtube.com/watch?v=UNlP9TGZOMI
▶️ Remembering David Johnstonhttps://www.youtube.com/watch?v=Sg2rufseJ_w
🔗 From Quiet Mountain to Cataclysmhttps://quakefeed.substack.com/p/from-quiet-mountain-to-cataclysm
📱 Download QuakeFeed for Real-Time Alerts
Stay informed and safe – get the QuakeFeed app now:
https://apps.apple.com/app/quakefeed-earthquake-alerts/id403037266
Subscribe to QuakeFeed Premium for the full range of features – including the Erupting Volcanoes map layer. It’s free for 30-days for first-time subscribers.
🌍 Connect with UsSubstack: https://quakefeed.substack.com
YouTube: https://youtube.com/@QuakeFeed
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Twitter/X: https://twitter.com/QuakeFeed
🙌 Support the Show
If you found this episode helpful, please rate, review, and share it. Your support helps others stay informed and prepared.
🎵 Music By Soularflair
Bio on FMA: https://freemusicarchive.org/music/Soularflair/bio
CC-BY License: https://creativecommons.org/licenses/by/4.0/
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We exhaust our repertoire of tectonic plate jokes while introducing the following topics: the earth’s layers, what are tectonic plates, three types of plate boundaries, plate boundaries vs faults, and how earthquakes happen.
This is a brief overview to lay the groundwork. (… pun intended!) Future episodes will dive deeper.
INTERACTIVE LESSON
We explain how to use the QuakeFeed app to locate plate boundaries and faults on the Quake Map.
Download QuakeFeed from the App StoreASK THE SCIENCE KID
We answer an interesting question about earthquakes in Antarctica.Our goal is to inspire CURIOSITY!
We hope you and your family enjoy our lighthearted humor while learning something new about this AWESOME planet we call home.
LINKS TO LEARN MORE
The Great ShakeOut: Join 14+ million people on October 21st by practicing how to be safer during earthquakes.
https://www.shakeout.orgIRIS Earthquake Science: Earthquake Faults, Plate Boundaries, & Stress
https://www.youtube.com/watch?v=8HxRVJPXNLMUSGS: Do earthquakes occur in Antarctica?
https://www.usgs.gov/faqs/do-earthquakes-occur-antarctica
USGS: Listening to the Earth at the South Pole (QSPA)
https://www.usgs.gov/natural-hazards/earthquake-hazards/science/listening-earth-south-pole -
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*NOT A FULL EPISODE* Just a quick announcement about QuakeFeed v5.1.0, available now in the App Store. This update adds three new features: USA Wildfires, Map Legend, and Aftershock Forecasts.
The USA Wildfires data layer requires a QuakeFeed Premium subscription. While viewing the map, tap on a wildfire symbol to view detailed information, such as: acres burned, percent contained, how many buildings were destroyed, how many firefighters are fighting it, etc.
The Map Legend and Aftershock Forecasts features are included in the free / ad-supported version. You will find the Map Legend button in the top right corner of the map. The USGS Aftershock Forecasts are linked in Quake Details. NOTE: The USGS only publishes aftershock forecasts for larger earthquakes. These quakes will include the words “Aftershock Forecast” in the Quake List, to let you know that it is available.
Next month, we will add more more wildfire features to QuakeFeed Premium, such as wildfire alerts and a wildfire list view.
We hope to get back to full podcast episodes soon. We have been coping with a family medical emergency for the past several months. Thank you for your patience and understanding.
We hope you enjoy QuakeFeed v5.1.0. If you have any questions, concerns, or feedback, please tap the ? in the top right corner of QuakeFeed then tap Ask to send us a support email.
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You’ll laugh, you’ll cry, you’ll learn how to protect yourself in an earthquake!
When the shaking starts, what should you do? We use a bit of humor to help you remember that Drop, Cover and Hold On reduces your chance of injury in an earthquake. We also dispel some common myths about earthquake safety. We hope you enjoy. Stay safe!
Links for more learning:
Drop, Cover, Hold On | Shakeout.org
https://www.shakeout.org/dropcoverholdon/EARTHQUAKE SAFETY VIDEO SERIES
If You're Near a Sturdy Desk or Table
https://www.youtube.com/watch?v=GSDmqLQmMN0&t=9sIf There's NO Sturdy Desk or Table
https://www.youtube.com/watch?v=HxMCoE0CIcAIf You're in Bed
https://www.youtube.com/watch?v=I922_UR8hpMIf You Have a Mobility Disability
https://www.youtube.com/watch?v=PZtDYlOfwrQLA Story earthquake scene
https://www.youtube.com/watch?v=3Yz2RC9C1tM -
Linda and Sequoya travel through time to April 14, 1906 and visit San Francisco. They ride a cable car down Market Street and see a bustling, prosperous city. Next, they travel forward four days and witness the 1906 San Francisco Earthquake. The devastating M7.9 quake and the fire that followed took 3,000 lives and destroyed 80% of the city. It also marked the dawn of modern scientific earthquake research in the United States.
If you’re curious to learn more, explore the links below.
A trip down Market Street before the fire
https://www.loc.gov/item/00694408/A Trip Down Market Street, 1906 - 4k, Colorized, 60fps
https://www.youtube.com/watch?v=1Ok_lwYyHWoRediscovered film takes a trip through San Francisco in ruins
https://www.youtube.com/watch?v=Fm1XSX8Un5QSan Francisco earthquake and fire, April 18, 1906
https://www.loc.gov/item/00694425/The Great 1906 San Francisco Earthquake
https://earthquake.usgs.gov/earthquakes/events/1906calif/18april/Devastation of 1906 San Francisco Earthquake
https://www.usgs.gov/media/images/devastation-1906-san-francisco-earthquake1906 San Francisco earthquake
https://en.wikipedia.org/wiki/1906_San_Francisco_earthquakeElastic rebound with Single Block Model
https://www.youtube.com/watch?v=JYQLIpo4kwkElastic Rebound Talk
https://www.youtube.com/watch?v=iB6jl37LbqAEarthquake Intensity—What controls the shaking you feel?
https://www.youtube.com/watch?v=BP7gKXLjqxkMercalli Intensity Scale Explained
https://www.youtube.com/watch?v=OHSJcYDaKlcNew Map Reveals Ships Buried Below San Francisco
https://www.nationalgeographic.com/history/article/map-ships-buried-san-franciscoThank you for listening, we hope you enjoyed our podcast!
Be one of the first 20 people to send us feedback and we’ll send you an offer code for one year of QuakeFeed Premium! Here’s how: In QuakeFeed, tap the ? in the top right corner and then tap Ask to send us a message. Tell us your thoughts - what you did or didn’t like, or any other feedback you have.
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Coming soon, a new podcast about earthquake science and safety. Are you curious about what causes the earth to shake? Do you know how to stay safe when it does? Join us to learn the answers to these questions and more. We'll also share interesting stories about historical earthquakes and discuss notable quakes that happened recently.
