Real-Time Interactive Earthquake Map - University of California, …
Earthquakes are shown as circles sized by magnitude (red, < 1 hour; blue, < 1 day, yellow, < 1 week). Click or tap on a circle to view more details about an earthquake, such as location, …
Berkeley Moment Tensor Project
These diagrams are obtained from the analysis of seismic waveform data, the most basic type being whether the P-wave first motion is up or down on the vertical instrument. The azimuths …
How to Read a Seismogram - Part II
Jan 1, 2012 · The cause was an earthquake under the Western Pacific, about 300 miles southwest of Tokyo. The focus of the quake with a magnitude of 6.8 lay in the Earth's upper …
Richard Allen - ShakeAlert
Shortly after the M9 Tohoku-Oki earthquake in Japan, Berkeley organized an early warning summit bringing together scientists, business leaders and legislators to review the …
How to Read a Seismogram - University of California, Berkeley
Jan 5, 2009 · Picture 2: Seismogram showing M 7.6 earthquake in West Irian Jaya. What are these phases? As the seismic waves travel from the earthquake focus through the earth, they …
A Slow Emergency and a Sudden Slump
May 7, 2018 · To investigate the nature of the various earthquake sequences, let's look at an impressive time lapse animation of the seismicity under the south-east corner of the Big Island …
Earthquake Early Warning at the Berkeley Seismo Lab
Earthquake early warning is the rapid detection of earthquakes, real-time assessment of the shaking hazard, and notification of people in the area of shaking. Warnings can arrive before, …
Burned by the Ring of Fire - seismo.berkeley.edu
Apr 17, 2016 · The red dots on this map show the locations of the 7.8 earthquake in northwestern Ecuador and its aftershocks. The dots in other colors mark previous, unrelated quakes.
P-waves and S-waves - which are faster?
Sep 10, 2008 · Looking at a seismogram of the Alamo earthquake (Fig. 3) the time difference between the arrivals of P- and S- waves is 3.5 seconds. This seismogram was recorded at our …
A nationwide online system launched in 2007, it detects tremors, calculates an earthquake's epicenter and sends out brief warnings from its 1,000-plus seismographs scattered throughout …