Data Formats

What is the GCF Format? Open

NOTE THIS LINK WILL TAKE YOU FIRST TO A LICENSING ACCEPTANCE PAGE Güralp Systems digital instruments and data modules use…

NOTE THIS LINK WILL TAKE YOU FIRST TO A LICENSING ACCEPTANCE PAGE

Güralp Systems digital instruments and data modules use Güralp Compressed Format (GCF) to share seismic data. The format is used both for data storage and for data transmission over serial links or TCP/UDP networks. Two protocols, the BRP protocol and the scream protocol, are used for transmitting GCF data. Read more...

GCF Data Formats Data Acquisition

How do I use GCF data in third party software? Open

This article explains how to convert seismic data from Guralp Systems instruments into the formats required by different analysis packages.…

This article explains how to convert seismic data from Guralp Systems instruments into the formats required by different analysis packages. Depending on your application, data streams can be converted in real time, or saved in GCF format and converted to your preferred format later. Read more...

GCF Data Formats Data Acquisition

How do I extract data from GCF files? Open

The easiest way to extract data from a GCF file is by using the “View” mode of Scream!. Read more...

GCF Data Formats Data Acquisition

What tools are there for working with GCF data? Open

Güralp provide a number of GCF file format conversion utilities to help with protocol conversion and common data management tasks…

Güralp provide a number of GCF file format conversion utilities to help with protocol conversion and common data management tasks you can access these in the Firmware and Software area.

GCF Data Formats Data Acquisition

How do I understand Stream IDs? Open

GCF data from digitisers are identified by the combination of System ID and Stream ID. The “System ID” identifies the…

GCF data from digitisers are identified by the combination of System ID and Stream ID. The “System ID” identifies the digitiser from which the data originate and each stream from a given digitiser is then identified by its “Stream ID”. Each Stream ID is composed of two parts, the “Serial Number” and a two-character suffix to identify which data are contained in the stream. Read more...

GCF Data Formats Data Acquisition

How do I run simultaneous Scream! instances? Open

Scream is designed to work as a robust part of your seismic network. By default, it uses the configuration file…

Scream is designed to work as a robust part of your seismic network. By default, it uses the configuration file scream.ini to set itself up automatically when restarted. However, in certain circumstances you may want to run two or more instances of Scream simultaneously on the same computer, with each instance having a different configuration. Read more...

Scream! Data Formats Data Acquisition

How do I create a Windows shortcut for Scream!? Open

The following procedure creates a shortcut with stored command-line arguments. This makes it easy for you to start Scream with…

The following procedure creates a shortcut with stored command-line arguments. This makes it easy for you to start Scream with the same arguments every time or, by placing the shortcut in your Start-up folder, to start Scream automatically every time you log on. It is also the simplest way to regularly start Scream with a different initialisation file, which is required if you wish to run more than one copy of Scream simultaneously. Read more...

Scream! Data Formats Data Acquisition

How do I manage units and scaling in Scream!? Open

Scream! allows you to explore seismic waveforms by zooming and scaling, and also has the ability to display time series…

Scream! allows you to explore seismic waveforms by zooming and scaling, and also has the ability to display time series in physical units. This how-to explains the differences between these features. Read more...

Scream! Data Formats Data Acquisition

How do I explore the frequency domain in Scream!? Open

Scream! allows you to apply filters of your own design to WaveView windows. Each WaveView window can have its own…

Scream! allows you to apply filters of your own design to WaveView windows. Each WaveView window can have its own filter settings, either using a preset filter or one you have designed. You can use this feature to view the same data in several frequency ranges at once. Read more...

Scream! Data Formats Data Acquisition

How do I run Scream! on a 64-bit Linux system? Open

It is often necessary to install additional libraries in order to run Scream! and the other Güralp linux tools, such…

It is often necessary to install additional libraries in order to run Scream! and the other Güralp linux tools, such as gcf2msd or gcf2sac on 64-bit Linux platforms. The precise details vary between distributions but most will follow either the Debian/Ubuntu model or the Red Hat/Fedora/CentOS model, for which details are given below. Read more...

Scream! Data Formats Data Acquisition

How do I integrate Scream! with Ubuntu Dash? Open

The Linux build of Scream! is intended to work with many different Linux distributions. For this reason, it does not…

The Linux build of Scream! is intended to work with many different Linux distributions. For this reason, it does not include any distribution-specific features. It is usually possible to perform a few post-installation steps which improve the integration of Scream! with the host operating system. This document describes how to integrate Scream! into the Ubuntu Dash, which makes it behave more like a Ubuntu-supplied application. Read more...

Scream! Data Formats Data Acquisition

How do I use InfoBlocks with Scream!? Open

DM24 and CD24 digitisers have a 1kb memory region which can be used to store information about attached sensors and…

DM24 and CD24 digitisers have a 1kb memory region which can be used to store information about attached sensors and the digitisers themselves. Users are free to store any data they wish in the digitiser’s information block.

Typically, this is used to store calibration parameters, poles and zeroes, etc. Newer digital sensors have their calibration information pre-loaded into the information block. DM24mk3 instruments use this information to perform their strong motion calculations. Read more...

Scream! Data Formats Data Acquisition

How do I build networks with Scream!? Open

Scream! uses its own protocol for transmitting seismic data over the Internet. The Network Control window within Scream! lets you…

Scream! uses its own protocol for transmitting seismic data over the Internet. The Network Control window within Scream! lets you manage a seismic array with multiple data sources, using this protocol. Read more...

Scream! Data Formats Data Acquisition

How do I locate my scream.ini file? Open

When requesting technical support, you may sometimes be asked to provide a copy of your scream.ini file. There is no…

When requesting technical support, you may sometimes be asked to provide a copy of your scream.ini file. There is no restriction on where this file can be placed so this document is intended to help you locate it. Once you know its location, you can simply attach it to an email. Read more...

Scream! Data Formats Data Acquisition

COMMON QUESTIONS