Stuart Koyanagi (Former Employee)
Science and Products
Volcano Watch — Anatahan Volcano's ash clouds reach new heights
The U.S. Geological Survey (USGS), in cooperation with the Emergency Management Office (EMO) in the Commonwealth of the Northern Mariana Islands, continues to monitor Anatahan volcano. We last "visited" Anatahan through a Volcano Watch article in April 2004, while it was experiencing its second major eruptive episode. The current eruptive activity began on January 4, 2005.
Volcano Watch — Mauna Loa signals a change as Spring arrives
Each week since October 2002, seismologists at the U.S. Geological Survey's Hawaiʻian Volcano Observatory (HVO) have provided brief synopses of the ongoing rumblings beneath Mauna Loa. Our last detailed discussion of the activity occurred last Thanksgiving, when we proclaimed the continuation of deep, long-period (3-5 cycles per second) Mauna Loa seismic events.
Volcano Watch — Deep Mauna Loa seismicity continues
While breakouts in the coastal area below Pu`u `O`o, attract renewed attention from scientists and visitors alike, seismologists at the U.S. Geological Survey's Hawaiʻian Volcano Observatory (HVO) have been vigilantly recording and cataloging what has been termed "unprecedented" deep seismicity under the summit region of Mauna Loa.
Volcano Watch — Can we predict the next "big" one?
On November 29, 1975, the latest magnitude-7 earthquake in Hawai`i struck near Kalapana, causing a tsunami that killed two campers at Halape and resulting in $14 million (2003 dollars) in damage. It was the only magnitude-7 earthquake to hit the Big Island during the 20th century.
Volcano Watch — The Anatahan eruption: what might happen down the road
The eruption of Anatahan Volcano in the Commonwealth of the Northern Mariana Islands (CNMI) continues. It has generated much interest in the volcanologic community and among the residents of Saipan and Guam. It has, unfortunately, also generated exaggerated accounts on the Internet.
Volcano Watch — Collecting Data on Earthquake Effects
One morning, you're awakened by a violent shaking of your bed; you hear the glass jalousies rattle, and the dog barks hysterically. In the seconds it takes to put your wits together, the sensation is over, and all is calm again.
Volcano Watch — Calibrating earthquake counts beneath Mauna Loa
A "Volcano Watch" article several weeks ago indicated changes occurring atop Mauna Loa. Specifically, global positioning system (GPS) receivers on Mauna Loa are showing that after eight years of steady contraction, extension is again occurring across the summit. Over 2 cm of the 7 cm lost to contraction since 1993 has been regained in the last five months.
Volcano Watch — A reminder that we live in earthquake country..
For years, scientists have tried to understand what causes earthquakes. They have recorded, catalogued, and analyzed them.
Volcano Watch — Are earthquakes on the rise?
A heightened awareness of earthquakes usually follows large and destructive ones, like those occurring in Turkey and El Salvador in 1999 and 2001, respectively. Combined, these earthquakes killed more than 37,000 people.
Volcano Watch — Day in the life of an earthquake analyst
A "Volcano Watch" article several months ago provided an overview of the recently installed current earthquakes web pages at the Hawaiian Volcano Observatory (HVO). Behind the scenes at HVO are people responsible for maintaining the seismic stations, performing data analysis, and producing catalogs, along with many other data products.
Volcano Watch — Earthquake information for the world
Whenever a large, destructive earthquake occurs anywhere in the world, such as those in Sumatera and El Salvador on January 13, there is an agency within the U.S. Geological Survey responsible for disseminating information about its location and magnitude on a rapid basis 24 hours a day--the National EarthquakeInformation Center (NEIC).