The GeoBlogosphere

A List of All/Many Geoblogs by Ron Schott [site is inaccessible]
A List of Many Geoblogs (Geobulletin)
A List of Some Inactive Geoblogs
About Geology (good ref; defunct blog)
Accidental Remediation
Active Tectonics Blog
Adventures of a Laura
Agile*
All Over the Map
All-geo (tumblr)
Amphibol (German)
Ancient Shore
Andrew Alden at KQED
A New Zeal and an Old Volcano
Arizona Geology
Arkansas Geological Survey Blog
Bloc de Camp (Catalàn)
Carbonacea
City of Volcanoes
Colorado Earth Science
confessions of a rockaholic
DC Geology Events
Dave McGarvie (Iceland Volcano Blog)
Diary of a Geology Student
Don't Panic Geocast
Dr. Anne Jefferson's Watershed Hydrology Lab
Earth Learning Idea
Earth Science Erratics - currently inactive but available for guest posts!
Earth Science Society
Earth and Mind
Earth-of-fire (French)
EarthSky Blogs
Earthly Musings - Wayne Ranney
Economic Geology Blog
Effjot - (also in German)
Elise Harrington's research blog
En Tequila Es Verdad
Environment and Geology
Eruptions
Exploring the Earth
For the Sediment Record
Frances Deegan's posts
GeoCastAway (Spanish)
GeoCosas
GeoIGN2.3 (Japanese)
GeoLog (the EGU blog)
Geological Society of London blog
Geology News (Geology.com)
Geology and Earth Science Images - Marli Miller (not a blog)
Geology and More blog (Greek)
Geology for Global Development
Geology in Motion
Geology in the West Country
Geology is Hard
Geología Venezolana (Spanish)
Geomagnetism.org
Georneys
Geosciblog
Geoscienceimaging Blog (CWCarrigan)
GeoSciTweeps
Geotripper
Geotripper Images (not a blog)
Girls into Geoscience
Gravel Beach
Green Gabbro
Highly Allochthonous
Hindered Settling
History of Geology
Hudson Valley Geologist
Hypo-theses
Iceland geology blog
In the Company of Plants and Rocks
In the Company of Volcanoes
Infogeología (Spanish)
Jane McArthur's blog
JOIDES Resolution Blogs
Julian's Blog
Lauret Savoy | Blog
Life Traces of the Georgia Coast
Locos por la Geologia (Spanish)
Looking for Detachment
Lounge of the Lab Lemming
Magma Cum Laude
Maitri's VatulBlog
Metageologist
Mini Me Geology Blog
Mount Baker Volcano Research Center
Mountain Beltway
My Patchwork Planet
Natural Hazards, GIS, and Disaster Management
NBMG | Blog of the Nevada Bureau of Mines and Geology
Northern Rivers Geology
Oakland Geology
Off the shelf edge
OnCirculation
Ontario Geofish
Outcrop (Avon RIGS Group)
Outside The Interzone
Paleoseismicity.org
Pangeology
Peligros Geológicos en el Perú (Spanish)
Petróleo Sin Riesgos (Spanish)
Pikes Peak Pebble Pups and Earth Science Scholars
Poikiloblastic
Polar Soils Blog
Rapid Uplift
Reading the Washington Landscape
Retos Terrícolas (Spanish & English)
Riparian Rap
Rock-Head Sciences
rock_jockey
Rocks and Water
Rockwatching
Ron Schott's Geology Home Companion
Rosetta Stones
Sandatlas
Sciency Thoughts
Sedimentary Lifestyle
seis-matters
Seismo Blog
Shaken Not Stirred
Shaken Not Stirred! The Volcano Diaries
Speaking of Geoscience (GSA Guest Blog)
Stories in Stone Blog
Tales from Mid-Ocean Ridges (Japanese)
The Geochristian
The Geology P.A.G.E.
The Landslide Blog
The Lost Geologist
The Pale Blue Dot
The Petrographer
The Plainspoken Scientist (AGU)
The Road to Endeavour
The Trembling Earth
Through the Sandglass
TravelingGeologist
Un geólogo en apuros (Spanish) - Nahum Chazarra
Utah Geological Survey Blog
Volcan01010
Volcanicdegassing
Volcano Blog by Tom Pering
Wandering Spheres
WATCHING FOR ROCKS-Travels of a Sharp-eyed Geologist
Wogelix
Wooster Geologists
Written In Stone...seen through my lens
The Wilds of Wyoming: A Little Bit of Culture, A Little Bit of Dirt
Your Friendly Neighborhood Geologist