All Stories by Sid Perkins
- Earth
Footprints could push back tetrapod origins
Newly discovered trackways much older than previous evidence for sea-to-land transition.
- Earth
Tides in Earth’s crust trigger small, deep quakes
Study of one portion of the San Andreas fault finds that just a little added stress from crustal tides makes a quake more likely.
- Life
Groovy teeth suggest dinosaur was venomous
Fossils show depression in upper jaw that held venom-producing glands.
- Earth
Mistletoe leaves a big carbon footprint in Yellowstone
Earth sciences reporter Sid Perkins blogs on new research from the annual meeting of the American Geophysical Union in San Francisco.
- Earth
Cameras catch underwater volcano in the act
Seafloor eruption in the South Pacific is the deepest and most violent yet seen.
- Climate
Carbon dioxide: Blame where blame is due?
Blog: Measuring outsourcing of greenhouse gases. From the annual meeting of the American Geophysical Union.
- Earth
Carbon dioxide: blame where blame is due?
Tracking the outsourcing of greenhouse gas emissions.
- Earth
Seismology in your backyard (and on your Twitter feed)
With two USGS programs, Twitter, inexpensive seismic equipment transform citizens into scientists.
- Earth
Earth’s magnetic field … updated
Three most used models of Earth's magnetic field are revised to reflect small changes in the field.
- Earth
Irrigation draining California groundwater at ‘unsustainable’ pace
The GRACE satellites have tracked water movement from the Central Valley since 2003.
- Paleontology
New fossil helps solidify dino origins
The dog-sized creature bolsters the notion that early dinosaurs first appeared in what is now South America.
- Earth
Earth’s atmosphere may be extraterrestrial in origin
Analyses of krypton, xenon hint that air didn’t fizz from within the planet.
