Data Services Newsletter

Volume 9 : No 4 : December 2007

DHI Clients

DHI icon

The Data Handling Interface (DHI) is a CORBA data access framework allowing users to access seismic data and metadata from IRIS DMC and other participating institutions directly from a DHI-supporting client program. The effect is to eliminate the extra steps of running separate query interfaces and downloading of data before visualization and processing can occur. The information is loaded directly into the application for immediate use. Several DHI Clients are described below.

Earth Motion Monitor

Earth Motion Monitor is a Mac OS X application that allows browsing seismogram data available through the IRIS Data Handling Interface (DHI) seismogram servers. Charles Ammon designed the program to browse the data in an earthquake-centric way (as opposed to station-centric). Available for Mac OS 10.4.x and later.


FetchResp is a program which will download response information from the IRIS Network Data Center. It is intended to be run as a script either from the command line using a terminal window or with cron using crontab. More information


FISSURES is an effort to define object-oriented seismic classes so that software developers can use standard objects for seismology. MATLABĀ® is a scientific/engineering computing language that is very popular among seismologists. The FISSURES-MATLAB Interface (FMI) is an effort to build a bridge between FISSURES and MATLAB. It allows MATLAB users to take advantage of FISSURES framework to handle seismic data without knowing the details of FISSURES and java coding, and to easily build their own clients. More information

Global Earthquake Explorer (GEE)

GEE is an education and outreach tool for seismology that aims to make it easy for non-seismologists to retrieve, display and analyze seismic data. It is intended for use in a classroom setting as a supplement to textbook material, which often lacks real world connections. More information


JEvalResp is a Java version of the ‘evalresp’ program and, like the original, it is designed to evaluate the response information from ASCIIRESP” files generated by rdseed (V4.16 and above). JEvalResp is also capable of fetching and processing responses from FISSURES servers. More information


JPlotResp is a graphically-oriented Java program for processing and plotting the response information from ASCIIRESP” files generated by rdseed (V4.16 and above). JPlotResp is also capable of fetching and processing responses from FISSURES servers. More information

JWEEDNew Release

JWEED is a powerful, event-oriented data access tool. The application combines an easy to use grahical user interface with an array of features designed to aid the user in retrieving seismograms. Manual | Newsletter article on JWEED


SAC DHI allows the SAC program to connect via the Internet to the DHI online systems. Requires SAC software. Newsletter article on the SAC DHI

Standing Order for Data (SOD)

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. “More information: | Documentation


The SOSA application (Synthetic and Observed Seismogram Analysis) combines the common tasks of retrieving observed and synthetic seismograms and applying analysis routines into a single software application. More information | Tutorial

SQUID – Single Query User Interface for Data

SQUID will allow users to view and manipulate PBO borehole strainmeter data. The program will retrieve processing information, stored in XML format, and raw SEED data from the IRIS DMC and NCEDC and will enable the user to apply atmospheric pressure, tidal and borehole corrections to the raw data. More information

VASEStream seismograms to your computer

VASE is a Java-based client application designed for viewing and extracting seismic waveforms from the DHI waveform repositories. In addition to streaming seismograms in near real-time, VASE provides access to most of the archived data at IRIS. VASE can save data to your computer in either SAC, SAC ASCII or miniseed format. Manual | Newsletter article on VASE

DHI Information

by Tim Knight (IRIS Data Management Center)

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