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Science is only a tweet away. Tweets do not = endorsement: on.doi.gov/pgwu0Y
Reston, VAusgs.govJoined April 2008
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USGS’s Tweets

USGS
@USGS
Dome fountain of episode 10, October 10–13, 1969, eruption of Kilauea Volcano. This dome fountain is about 20 m (65 ft) high. Symmetrical dome fountains such as this are rare. #Tbt #HI
@Volcanoes_NPS
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Forty-one years ago, Mount St. Helens cataclysmically erupted. The May 18, 1980, eruption and its effects were heavily photographed from numerous vantage points, but click here: ow.ly/fi1950ENRmL to view rarely seen archival footage of the rising ash column.
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In Puerto Rico, earthquakes are more active than normal. These earthquakes, also called aftershocks, are occurring near the mainshock and are part of what we call a sequence. 1/5
Map of Puerto Rico showing aftershocks as different colored dots on the map.
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The area around the Mw6.4 Nevada EQ will continue to experience more earthquakes than usual. Some may be larger, but many smaller. Follow our aftershock forecast (ow.ly/rLHT50zH8Xr) and remember to always Drop, Cover, and Hold on if you feel shaking. #usgs #NVQuake.
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A new Hawaiian Island is forming! The Lō‘ihi Seamount is taking shape beneath the Pacific Ocean. Although it's exciting to watch an island form, it’s still too early to make travel reservations—it won’t peek from the ocean surface for another 10,000–100,000 yrs. #OceanMonth2020
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New aftershock scenario forecast indicates 84% chance that no more large earthquakes (>M 6.0) will occur in Puerto Rico over next 30-days. Moderate (M 5.0+) and light shaking (M 3.0+) still likely. Read more in our Top Story: ow.ly/d5rR50xSKiq
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Before it erupted on May 18th, 1980, Mount St. Helens was considered one of the most beautiful peaks in the Cascade Range. Spirit Lake was a popular area for camping, boating, fishing and hiking. To see more photos, visit: ow.ly/KZ5s50zJ6El Photo: US Forest Service #MSH40
Mount St. Helens before the May 18, 1980 eruption. View from the northeast of Spirit Lake.
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Alerts were sent for a M6.8 in California. This was an error. More information to come.
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Bats don't always appreciate being handled for research, but after examination they often appreciate the warmth and need a little push to go. This Western red bat was captured during USGS research to learn about their ecology, distribution, and movement patterns. #BatWeek
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Paleowetlands: Dry as a bone now, but 13,000 years ago, this area in SE Arizona was the site of a shallow marsh teeming with megafauna. The black mat (just above the chalky white bed in middle) indicates an abrupt change in climate conditions #Geology101
Wetland deposits at the Murray Springs Paleoindian Site in southeastern Arizona
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USGS Earthquake Science Center Mobile Laser Scanning truck scanning the surface rupture near the zone of maximum surface displacement of the M7.1 Searles Valley earthquake. Photo credit: Ben Brooks, Todd Ericksen USGS-ESC
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Happy 158th birthday, Richard Oldham, discoverer of Earth's core from 1897 great earthquake "shadow zone".
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Mesa Verde National Park, which was was created on June 29, 1906, is a beautiful example of how geology affects landscapes and people. Explore the geology and ecology of Mesa Verde at: ow.ly/mJ1p50Aj9dY
The massive and uniform appearance of the Upper Cliff House Sandstone forms the cap rock of the Cliff Palace at Mesa Verde NP.
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Slickensides are polished, grooved rock surfaces caused by one rock mass moving across another on a fault. Photo: Wasatch fault scarp, Utah. Lance the good boy for scale 🐕 #Geology101 #geology ⛏️
image of slickenside rock formation along a Utah mountain, with a dog posing next to the outcrop
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@USGS
Since many students are home, check out the new USGS Learning from Home Webpage. Your first stop for learning resources from USGS! Browse by grade level for fun and educational activities. ow.ly/syT950yO4FF
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Hankering for an in-depth look at the 4.5-billion-year-old history of Earth’s nearest neighbor? Well, the #USGS has just released the most detailed geologic map of the moon ever created. Start digging around & see what you can discover. ow.ly/qk5E50zgihd
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THREAD: Major (Mw 7.1) quake occurred 17 km NNE of Ridgecrest, CA on China Lake Naval Air Center at 8:19pm local time, July 5, 2019. Closest large pop. center is Ridgecrest with pop. of 28k people. This is continuation of sequence that started w/Mw 6.4 approx. 36 hrs beforehand
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#Onthisday in 1906 - Devils Tower was declared America's first National Monument by President Theodore Roosevelt.
Devils Tower
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Molten lava can cool quickly as glass particles called Pele's tears, named after the Hawaiian goddess of volcanoes. This one was found in Jan 2016 on the rim of Halema‘uma‘u Crater, Kīlauea. #MagmaMonday
image of pele's tear
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Since the size of volcanic eruptions can’t be determined by instruments, the Volcanic Explosivity Index or VEI is used to express the size of explosive volcanic eruptions. Learn about the VEI in this week’s edition of Caldera Chronicles: ow.ly/eoaZ50Meun8 #Volcanoes 🌋
The Volcanic Explosivity Index or VEI is used to express the size of explosive volcanic eruptions. Volume of products, eruption cloud height, and qualitative observations (using terms ranging from "gentle" to "mega-colossal") are used to determine the explosivity value.
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Crater Lake National Park in Oregon was established #OnThisDay in 1902. Occupying a caldera formed 7700 years ago by the collapse of Mt. Mazama, Crater Lake is the deepest lake in the United States and one of the most spectacular. ow.ly/JG0l50ulOk2
Crater Lake Caldera with Wizard Island cinder cone.
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THREAD: Aftershock Forecast Updates: This forecast is based on data collected as of 7:55AM 2019-7-6 PDT According to our forecast, over the next 1 Week there is a 3 % chance of one or more aftershocks that are larger than magnitude 7.1...
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Friday’s #Geology101: Textbook example of an anticline (left "arch") and syncline (right "bowl") in the same formation. Credit: Barbara Ende
Anticline and Syncline
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The 6.0 M near the Bay Area this morning was the largest quake to hit that area since the Loma Prieta earthquake almost 25 years ago.
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THREAD: A strong (Mw 6.4) earthquake occurred 12 km SW of Searles Valley, California on the China Lake Naval Air Center at 10:33:48 am local time on July 4, 2019. The closest big population center is the city of Ridgecrest with a population of 28k people.
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