An official website of the United States government. Here's how you knowHere's how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Latest Earthquake | Chat Share
On August 18, 2015, heavy rainfall triggered around 60 landslides in and around the city of Sitka, AK. The landslides moved downslope rapidly; several were damaging and one of these demolished a home on South Kramer Avenue killing three people.
Instruments are used to monitor and detect changes in local conditions, including:
Data are updated every 60 minutes and displayed on graphs. Updates may be interrupted occasionally by instrument, computer, or network malfunctions.
The USGS has installed instruments at a site near the initiation zone of the fatal Kramer Ave. landslide on Harbor Mountain, above Sitka. The sensors are installed in two soil pits on the edge of a steep hollow similar to the initiation zones of past landslides. Data collection at this site supports research on hydrologic factors that control landslide initiation. In many landslide-prone hillsides, infiltration of water from rainfall increases ground-water pressures. These elevated pressures can, in turn, induce landslide movement.