Transcript Taber and Bravo PPT slides

IRIS Data Tools and
Animations
John Taber, Tammy Bravo,
Michael Hubenthal, Jenda Johnson
Outline
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Seismicity
Teachable Moments
Animations
Seismogram viewer
Prepackaged record sections (SPUD)
Seismogram retrieval (Web services)
IRIS Earthquake Browser
Explore global, regional, and local seismicity
Both recent and historic events
Easy to use and based on Google maps
Regional Seismicity
Explore Plate Boundaries
Exploring Forecasting & Prediction
Export Data
Teachable Moment slide sets
• Newsworthy earthquakes motivate students to
learn more about seismology
• Wide range of online resources available but
college faculty and teachers have little time to
prepare
• Slide sets produced within 1 day
– Most content from other groups, particularly USGS
– Try to tell a story
– In English and Spanish
Magnitude 8.8 OFFSHORE MAULE, CHILE
Saturday, February 27, 2010 at 06:34:17 UTC
This earthquake occurred at the boundary between
the Nazca and South American tectonic plates. The
two plates are converging at a rate of 80 mm per
year. The earthquake occurred as thrust-faulting on
the interface between the two plates, with the
Nazca plate moving down and landward below the
South American plate.
Simplified diagram of thrust faulting
during a subduction zone
earthquake. The sudden motion
along the fault displaces massive
volumes of seawater creating a
tsunami. (© 1999 Zeke Smith)
USGS Centroid Moment Tensor Solution
The tension axis (T) reflects the minimum
compressive stress direction. The
pressure axis (P) reflects the maximum
compressive stress direction.
Images courtesy of the U.S. Geological Survey
Magnitude 8.8 OFFSHORE MAULE, CHILE
Saturday, February 27, 2010 at 06:34:17 UTC
Although magnitude is still an
important measure of the size of an
earthquake, particularly for public
consumption, seismic moment is a
more physically meaningful measure
of earthquake size.
Seismic moment is proportional to the
product of the slip on the fault and the
area of the fault that slips.
Chile
Haiti
These “maps” of the slip on the fault
surfaces of the January 12th M7.0
Haitian earthquake and the M8.8
Chilean earthquake show that,
although the slip in Chile was only
about 50% greater, the fault area was
vastly larger. This accounts for the
release of approximately 500 times
more energy in the Chilean
earthquake than in the Haiti
earthquake.
Images courtesy of the U.S. Geological Survey
NZ eq animation
Animations
• Over 40 animations available online
– Created by Jenda Johnson
• Illustrating concepts related to plate tectonics, earth
structure, earthquakes, and volcanoes
• Includes background information and teaching sequences
using multiple animations
• Linked to activities and Teachable Moments
http://www.iris.edu/hq/programs/education_and_outreach/anim
ations
Based
on
Tom
Boyd
wave
front
movie
Student sequence
www.iris.edu/explore
Prepackaged Record Sections
from the Data Management
Center
Description at
www.iris.edu/
dms/products/eventplot
Data at
www.iris.edu/spud
Web services
www.iris.edu/ws/timeseries/builder
Viewing and Analysis Tools
• Existing
– SAC
– Matlab
– New
• jAmaseis
– Under development by Moravian College
• Seismic Canvas
– Glenn Kroeger
jAmaseis