Tag Archives: earthquakes

Thanksgiving Eruptions On the Sun

via http://www.nasa.gov/

On Nov. 23, 2012, at 8:54 a.m. EST, the sun erupted with an Earth-directed coronal mass ejection or CME. Experimental NASA research models, based on observations from the Solar Terrestrial Relations Observatory (STEREO) and the ESA/NASA mission the Solar and Heliospheric Observatory, show that the Nov. 23 CME left the sun at speeds of 375 miles per second, which is a slow to average speed for CMEs. This is the third Earth-directed CME since Nov. 20.

Not to be confused with a solar flare, a CME is a solar phenomenon that can send solar particles into space and can reach Earth one to three days later. When Earth-directed, CMEs can cause a space weather phenomenon called a geomagnetic storm, which occurs when CMEs successfully connect up with the outside of the Earth’s magnetic envelope, the magnetosphere, for an extended period of time. In the past, CMEs of this speed have not usually caused substantial geomagnetic storms. They have caused auroras near the poles but are unlikely to cause disruptions to electrical systems on Earth or interfere with GPS or satellite-based communications systems.

NOAA’s Space Weather Prediction Center (http://swpc.noaa.gov) is the United States Government official source for space weather forecasts.”

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Seismic Monitor

IRIS Realtime Seismic Monitor

Awesome!

Seismic Monitor allows you to monitor global earthquakes in near real-time, visit seismic stations around the world, and search the web for earthquake or region-related information. You can also view seismograms and make dataset requests via its WILBER interface.

The date and time of the map (in Universal Time) are located in the lower right hand corner.

Earthquakes are shown as colored circles, where the size of the circle tells you the magnitude of the quake, using the legend at the top left of the map. Only earthquakes of magnitude 4.0 or greater are displayed. (Locations and magnitudes are provided to IRIS by the USGS. Earthquakes greater than magnitude 4.0 may be missing from the USGS catalog in some parts of the wor ld because local networks have not yet reported them to the USGS. In such cases please check with your local or national network.)
Circle Color
Age of Earthquake
Red
the last 24 hours    <– animates briefly when page is loaded
Orange
from 24 to 48 hours
Yellow
from 3 days to 2 weeks
Purple
from 2 weeks up to 5 years
The distribution of earthquakes over the past 5 years is represented by the purple dots and demonstrates how earthquakes define the boundaries of tectonic plates, as well as the relationship between topography and earthquakes.
The Earth’s shadow shows the line between day and night as well as the progression of the seasons.

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