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 that it is …
Real-Time Interactive Earthquake Map - University of California, Berkeley
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, date/time, …
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 mantle, almost 220 …
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 hit major …
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 the country, one …
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, during, or after …
The hum of the Earth - University of California, Berkeley
(a) Schematic diagram showing how waveforms are mapped to the center of the array, here the Berkeley Digital Seismic Network (BDSN), assuming plane wave propagation.
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.
Today in Earthquake History: Assam 1950 - University of California ...
Aug 15, 2017 · Figure 1: The Great Assam earthquake of 1950 destroyed the railroad bridge in the Lakhimpur district, cutting the main connection between Assam and the rest of the subcontinent.
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 station BKS, …