# Earthquakes

Wget provides an alternative to the now defunct finger command for obtaining the list of the most recent 21 earthquakes located by the NEIC.

Here is some information on the use of seismic techniques to locate gunshots.

I put my publications list on line, for the fun of it!  :-)

A good summary paper on the Seismicity of Continental Alaska.

Oregon tectonic information.

The HYPOELLIPSE local-earthquake location program is located here:
as well as here:
ftp://hazards.cr.usgs.gov/LAHR/iaspei_pgms/hypoellipse/

IASPEI Global Inventory of Seismographic Networks

Here's an ancient paper on "Seismic Recording in an Indigenous Earthquake Prediction Program."  (MS Word format) .

Magnitude equations and amplitude versus distance graphs that show what we're up against in recording earthquakes.

Discussion of MS magnitude computation from the IASPEI New Manual of Seismological Observatory Practice (2002) edited by Peter Borman. (3.8 MB MSWord .doc file).

### Seismogram Interpretation

An introductory MS PowerPoint talk on seismogram interpretation from Clark Wilson at the University of Texas.  (Local copy.)

Chris Chapman's concise summary of seismic waves is modified from his message to the Public Seismic Network E-mail list.

Wolfgang Lenhardt Lecture on Seismogram Interpretation

There is a USGS site that one can use to find the arrival times at a given location for recent earthquakes.  This can help in finding the earthquakes that have been recorded at your seismograph station.

Using AmaSeis for seismogram interpretation -- an example earthquake from India.

### EPICS Course at Colorado School of Mines

During the 2002 Fall semester the Colorado School of Mines all 350 freshmen will be worked on the design of an inexpensive seismic system. They were divided into about 70 groups of 5 for this effort. Because the goal was to design an inexpensive instrument (less than \$150) some things may have to be sacrificed, including linearity and single-axis sensitivity.  The \$150 limit (exclusive of a PC) was to make this instrument a candidate for the GLOBE program, an educational program with international scope and many collaborators that is currently focused on weather, atmosphere, and biology issues.

## Public Seismic Network and Related Information

The AS1 seismic system is the one selected by IRIS for their Seismographs in Schools program.  Check it out here.

Corvallis Public Seismic Network (My Stuff)

Erhard Wielandt: "Seismic Sensors and their Calibration" in MSWord format.
(Earlier version in HTML format)

Larry Cochran's Amplifier/Filter Circuit

Dewayne Hill's Vertical (similar to an AS1).

Links to sites that may be helpful in understanding and building seismic equipment.

Bob McClure's seismometer designs.

Bob McClure's software for plotting the J-B travel time tables, graphing seismometer response, and more!

Dave Youden's Folded Pendulum Horizontal Design

Bryant Labs STM8 vertical

Ted Rogers' Folded Pendulum Horizontal Design

Jim Lehman's seismometer designs.

Frank Cooper's seismometer designs. (Good example of  ball bearing pivots.)

John Cole's seismometer designs.  (Good example of crossed cylinder pivots.)

Some notes on winding seismometer coils.

Here's some information on finding the coordinates of your station.

The Public Seismic Network consists of an informal group of people from around the world who enjoy the challenge of operating their own seismic equipment.  Larry Cochrane of Redwood City runs one of the largest PSN web sites and also hosts the PSN list server.

A seismic sensor based on levitated graphite?

Seismometer Applet

Seismometer Basics

#### Seismic station at St.-Michael-Gymnasium Monschau, Germany

2006 PSN Meeting in San Francisco

### Some Fun Hands-on Projects

Make a model seismometer to learn about the concept of recording ground vibrations.

Check out these hands-on ideas for some fun projects related to Earth Science and Seismology.

(Comments, Corrections, Feedback, & Questions are always welcome via Email)

Cursor design adapted from John Hernlund's web page.