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1. #SEISMOSIGNAL DOWNLOADING GROUND MOTIONS ZIP FILE#
2. #SEISMOSIGNAL DOWNLOADING GROUND MOTIONS CODE#
3. #SEISMOSIGNAL DOWNLOADING GROUND MOTIONS WINDOWS#

#SEISMOSIGNAL DOWNLOADING GROUND MOTIONS ZIP FILE#

You can download the zip file but you will have to compile it in order to use it.

The mseed2sac-2.0 package can be found here. I have chosen to use Matlab for this part as you will see later. The SAC files can then be processed more easily.

#SEISMOSIGNAL DOWNLOADING GROUND MOTIONS CODE#

The miniSEED files will first be converted to Seismic Analysis Code (SAC) files by use of the IRIS supported mseed2sac-2.0 package.

#SEISMOSIGNAL DOWNLOADING GROUND MOTIONS WINDOWS#

This process will involve the use the command prompt on the Windows platform. This process is just for miniSEED files and will not work for SEED files. MiniSEED format can be converted to SEED format through IRIS supported software. SEED files contain actual units of acceleration as well station information. MiniSEED files only give motions in terms of counts which can later be converted to normal units. It is also important to realize the difference between miniSEED files and SEED files. The date that is shown in the title of the file represents the date on which the file was downloaded, NOT the date of the event. The size of the file will change depending on the number of stations and channels that are available for that event. The event ID can be entered and a URL builder will provide a link to start the download.Ī miniSEED file will now be downloaded and the file should be titled similar to below. This can be done by selecting “Web Services” under the “Access Data” tab, then selecting “eventdata”. Next, to get the actual data for the event, the miniSEED (.mseed) file can be downloaded from the NCEDC database. This will help determine if this is the event that you actually want. An event ID, the exact time, location, depth, source (network), magnitude, and magnitude type will be displayed. From here, you can select the correct event. After conducting the search, NCEDC will display all of the events that fit the inputted parameters. Next select the “events” tab to access the search prompt. This search can be found by going to the NCEDC website and selecting “SeismiQuery” under the “Access Data” heading.

Parameters such as the time and date of occurrence, the location, the magnitude, and the depth of the event can be used to filter and search for a specific earthquake. To begin, NCEDC allows for specific seismic events to be searched for throughout the database. For information on acquiring data from IRIS please reference IRIS Database: An Introduction. This post will focus on accessing data from the NCEDC database. A list of IRIS supported networks and links to specific stations within those networks can be found here. However in the case of Northern California, the NCEDC includes many stations that are not supported in the IRIS database. The IRIS Database encompasses seismic networks spanning across the globe.

A complete list of the seismic networks within the NCEDC can be found here. The NCEDC encompasses many seismic networks in Northern California including the Northern California Seismic Network (NC), the Parkfield High Resolution Seismic Network (BP), the Berkeley Digital Seismic Network (BK), the Calpine/Unocal Geysers Network (UG), as well as a few others. Much like the IRIS Database, the Northern California Earthquake Data Center (NCEDC) has an extensive collection of seismic events and ground motions.