Owen A. Callahan, Ph.D.
@eegeos.bsky.social
Structural and geothermal geologist. Water/rock interaction, faults & fractures, deformation, mineralization, hot springs. UAS, GIS. Owner, En Échelon Geosolutions (www.eegeos.com). Associate faculty at Cabrillo College, Santa Cruz, CA. He/Him.
Oblique nighttime thermal image of a Cascade volcano and glacial stream...
July 24, 2025 at 12:23 AM
Oblique nighttime thermal image of a Cascade volcano and glacial stream...
This past week or two, I exchanged my typical Basin and Range field views with tree-choked, boulder-strewn streams in the North Cascades.
July 23, 2025 at 10:47 PM
This past week or two, I exchanged my typical Basin and Range field views with tree-choked, boulder-strewn streams in the North Cascades.
Here's a nice example of AI searches being total crap:
May 10, 2025 at 8:24 PM
Here's a nice example of AI searches being total crap:
Hot tubs, er, springs in western Nevada this morning.
April 16, 2025 at 5:57 PM
Hot tubs, er, springs in western Nevada this morning.
By that metric, among others, you folks are doing well.
April 5, 2025 at 5:34 AM
By that metric, among others, you folks are doing well.
It's quieter out here, save the wind.
February 28, 2025 at 3:50 PM
It's quieter out here, save the wind.
That was a cold week of midnight to predawn thermal drone work. Maybe too cold.
January 15, 2025 at 2:08 PM
That was a cold week of midnight to predawn thermal drone work. Maybe too cold.
I just finished a friends and family trip down the Black Canyon of the Colorado below Las Vegas. Great evidence for fluid flow in fractures in the canyon walls, hot springs, and seeps.
November 27, 2024 at 11:16 PM
I just finished a friends and family trip down the Black Canyon of the Colorado below Las Vegas. Great evidence for fluid flow in fractures in the canyon walls, hot springs, and seeps.
Why, yes, I WAS the only one dressed up for the field trip today.
November 1, 2024 at 1:11 AM
Why, yes, I WAS the only one dressed up for the field trip today.
For makeshift analog models, deforming flour is actually pretty fun.
October 22, 2024 at 10:46 PM
For makeshift analog models, deforming flour is actually pretty fun.
Warm ground on a cold Nevada night...
October 3, 2024 at 12:38 AM
Warm ground on a cold Nevada night...
I "had" to spend the afternoon scouting potential field trip sites around Aptos/Capitola for Intro Geology today. It may have involved ice cream too.
September 26, 2024 at 4:48 AM
I "had" to spend the afternoon scouting potential field trip sites around Aptos/Capitola for Intro Geology today. It may have involved ice cream too.
Fissure ridges and warm pools at Travertine Hot Springs, Bridgeport, California.
September 24, 2024 at 3:55 PM
Fissure ridges and warm pools at Travertine Hot Springs, Bridgeport, California.
We started out describing specific and generic material properties, in anticipation of minerals on Thursday...
August 27, 2024 at 9:18 PM
We started out describing specific and generic material properties, in anticipation of minerals on Thursday...
Shockingly, I'm not convinced AI was really ready to be unleashed.
August 27, 2024 at 2:31 PM
Shockingly, I'm not convinced AI was really ready to be unleashed.
Nice fault surface in silicified tuff if folks are looking for a Mirrors alternative...
July 16, 2024 at 12:07 AM
Nice fault surface in silicified tuff if folks are looking for a Mirrors alternative...
Today was too hot in Dyer, NV. We clocked 104.8 at 4 pm, 102.3 in the shade.
July 10, 2024 at 11:50 PM
Today was too hot in Dyer, NV. We clocked 104.8 at 4 pm, 102.3 in the shade.
Fun party trick: when camping near old fumaroles you can light native sulfur on fire and watch it burn blue.
July 9, 2024 at 11:36 PM
Fun party trick: when camping near old fumaroles you can light native sulfur on fire and watch it burn blue.