The IRIS DMC archives waveform data from stations around the world.
The following information highlights passive and active source data
available through the DMC.
Passive Source
Most of the data archived at the DMC is from broad-band stations
recording passive (or natural) source events. Some stations record
continuously, some have triggered channels. Most of the passive source
data are from permanent station installations and are archived in
SEED format, but some data come to us from temporary installations
and in formats other than SEED.
Active source refers to the creation of seismic events using explosives
or mechanical devices like air guns, from either experiments on land
or while underway on properly equipped research ships.
The video
clip shows the Seattle Kingdome implosion in March of 2000 that was
made part of an active source experiment called SHIPS (Seismic Hazards
Investigation Puget Sound) that utilized the planned demolition to
help
further understand the location of faults located in the Seattle
area.
Much of the active source data we have here at the DMC is recorded
using temporary deployments of instruments provided by the PASSCAL
program, but we do have some active source data from other sources.
Active source data can come in a variety of formats.
Batch access to the IRIS DMC archive can be obtained by electronically
mailing a specially formatted file to the IRIS DMC in Seattle.
These are BREQ_FAST files and provide a base level access to the
DMC needed by any user. Learn how to submit a BREQ_FAST
Request .
WebRequest - An easy way to submit a request for data
WebRequest is a data request form that allows users to submit
BREQ_FAST-formatted data requests to the DMC. Submit a WebRequest
NetDC - Networked Data Center Protocol
NetDC is a data request system that allows a user to request seismological
information from multiple data centers through a single email mechanism.
Information is delivered to the user through email and/or FTP in
a uniform binary or text format. Learn more about NetDC
SOD - Standing Order for Data
SOD is a program that automates tedious data selection, downloading,
and routine processing tasks in seismology. It allows you to
define your desired data based on earthquakes, recording stations,
and the resulting combination of information. SOD then retrieves
the data that matches the criteria. Learn more about SOD.
JWEED
Using JWEED a person can obtain waveforms from any institution which
has implemented DHI servers. JWEED now utilizes Web Mapping Services
(WMS) for displaying maps. Learn more about JWEED.
Most of the data archived at the DMC is from broad-band stations
recording passive (or natural) source events. Some stations record
continuously, some have triggered channels. Most of the passive source
data are from permanent station installations and are archived in
SEED format, but some data come to us from temporary installations
and in formats other than SEED.
