EarthScope Data

 

USArray Data at the DMC

The USArray component of the EarthScope experiment is a continental-scale seismic observatory designed to provide a foundation for integrated studies of continental lithosphere and deep Earth structure over a wide range of scales. USArray will provide new insight and new data to address fundamental questions in earthquake physics, volcanic processes, core-mantle interactions, active deformation and tectonics, continental structure and evolution, geodynamics, and crustal fluids (magmatic, hydrothermal, and meteoric). Learn more about the project at usarray.org

 

Quick links:
Transportable Array Overview
Reference Network Overview
Flexible Array Overview
Magnetotelluric Overview
All USArray Stations
Quality Control
Data Access
Data Access Examples
DMC EarthScope stats

USArray Data Overview

The IRIS DMC is the final archive and distribution point for all raw USArray data from each sub-component: Transportable Array, Reference Network (Backbone/Permanent Array), Flexible Array and Magnetotelluric Array.

 

The DMC's Virtual Network concept can be used to select various components of USArray data. The following table illustrates the scope of the USArray virtual networks:

 

Virtual Network code
Description
USArray Transportable Array stations
USArray Reference Network (including Backbone/Permanent Array) stations
USArray Flexible Array stations
USArray Magnetotelluric stations
All USArray stations

 

USArray Transportable Array

The Transportable Array is a set of 400 broadband stations that will, over the 10 year course of the project, traverse the conterminous United States. The DMC receives 40 and 1 samples/second seismic data streams from each site in addition to related state-of-health data in real-time. Since mid-2010, atmospheric sensors have been installed at the TA stations. Information about these sensors is available at usarray.org Atmospheric.

 

Station lists:

List
Description
List of Operating TA stations in HTML format
Operating Stations: XML, Text, MS-Excel
List of Operating TA stations in XML, Text (tab separated) and MS-Excel
List of all (past, present and future) TA stations in HTML format
All Stations: XML, Text, MS-Excel
List of all TA stations in XML, Text (tab separated values) and MS-Excel


Station maps:

Map Data
Description
Operating TA stations as a web-viewable Google Map
Operating TA stations as a KML NetworkLink (e.g. for Google Earth)
Operating TA stations web page
All TA stations (past, present & future) as web-viewable Google Map)
All TA stations as a KML NetworkLink (e.g. for Google Earth)

 

Station reports:

Report
Description
Summary of station information, created after station closure
Summary of station information, intended for the station hosts


 

USArray Reference Network (including Backbone/Permanent Array)

The Reference Network is composed of permanent stations at a roughly 300 km spacing across the United States and includes the 39 EarthScope-funded Permanent Array stations. The DMC receives 40 and 1 samples/second seismic data streams from most sites.


Station lists:

List
Description
List of Reference Network stations in HTML format
Stations: XML, Text, MS-Excel
Reference Network stations in XML, Text (tab separated values) and MS-Excel

Station maps:

Map Data
Description
Permanent Array stations as web-viewable Google Map
Reference Network stations as a KML NetworkLink (e.g. for Google Earth)
Reference Network stations as a GIF image file, conterminous US only

 

USArray Flexible Array

The Flexible Array is a set of broadband and active-source oriented instruments deployed on a temporary basis according to individual proposal (the PASSCAL model). Data rates and availability from Flexible Array deployments depend on the individual proposals.


Station lists:

List
Description
List of Flexible Array stations in HTML format
Stations: XML, Text, MS-Excel
Flexible Array stations in XML, Text (tab separated values) and MS-Excel

Station maps:

Map Data
Description
Flexible Array stations as web-viewable Google Map
Flexible Array stations as a KML NetworkLink (e.g. for Google Earth)
Flexible Array stations as a GIF image file

 

USArray Magnetotelluric

The magnetotelluric (MT) component of USArray consists of 7 permanent MT stations and a mobile array of 20 MT stations that will each be deployed for a period of about one month in regions of identified interest with a spacing of approximately 70 km.


Station lists:

List
Description
List of Magnetotelluric stations in HTML format
Stations: XML, Text, MS-Excel
Magnetotelluric stations in XML, Text (tab separated values) and MS-Excel

Station maps:

Map Data
Description
Magnetotelluric stations as web-viewable Google Map
Magnetotelluric stations as a KML NetworkLink (e.g. for Google Earth)
Magnetotelluric stations as a GIF image file

 

All USArray Stations

Station lists:

List
Description
List of Operating USArray stations in HTML format
Operating Stations: XML, Text, MS-Excel
List of Operating USArray stations in XML, Text (tab separated) and MS-Excel
List of all (past, present and future) USArray stations in HTML format
All Stations: XML, Text, MS-Excel
List of all USArray stations in XML, Text (tab separated values) and MS-Excel

Station maps:

Map Data
Description
Operating USArray stations as a web-viewable Google Map
Operating USArray stations as a KML NetworkLink (e.g. for Google Earth)
Operating USArray stations as a webpage, conterminous US only
All USArray stations (past, present & future) as web-viewable Google Map)
All USArray stations as a KML NetworkLink (e.g. for Google Earth)

 

 

USArray Quality Control at the DMC

The DMC performs both automated and manual quality control on USArray data. A small team of analysts review raw USArray data regularly in addition to performing higher level quality control measurements. More details are available on the USArray Quality Control Overview page.

 

 

To Request USArray Data from the DMC

All USArray data at the DMC is managed within the existing DMC infrastructure along with all the other, non-USArray data at the DMC. This means that USArray data is available via all the DMC's traditional request mechanisms.

 

Before requesting data for the first time, we recommend that you learn about requesting and using IRIS data in general. A good place to start is at IRIS DMC Data Access and IRIS DMC Data Mousepad.

 

Real-time data: IRIS distributes near-real time miniSEED data directly from our real-time collection system (BUD). Click here for details about getting data from our real-time systems. The recommended method for receiving real-time data feeds is with the DMC's SeedLink service.

 

Transportable Array and Reference Network

Data from both the Transportable Array and Reference Network are delivered to the DMC in near-real time in SEED format. It is available via all the DMC's traditional request mechanisms including near-real time. Approximately 7 days after arriving at the DMC the data are copied to the primary archive making them available to all request mechanisms. The data remain in, and are available via, the real-time collection system (BUD) for two months.

 

Transportable Array SEED data qualities (in order of increasing preference):

SEED Quality
Description
R
Data delivered to the IRIS DMC via real-time telemetry.
D
Gap-fill data delivered after real-time data, usually delivered within 3 months of real time.
Q
TA final station data sets delivered after station removal, these data are primarily onsite (Baler) data merged with real-time telemetered data.


Transportable Array data do not contain routine timing or other corrections, the differences in the data qualities is primarily completeness and, in the case of TA Final data sets, richness in terms of included data quality bits in the Mini-SEED headers.


Most DMC request mechanisms will default to returning the highest quality data, or a mix thereof, available for the request. Some request mechanisms also allow selection of specific qualities.


Transportable Array Channel Descriptions

The following is a list of all channels collected for the Transportable Array. Not all of these channels are available in real-time, and not all channels are available for every station.


Channel
Description
Sample Rate
BHZ
Broadband Seismometer Vertical ground velocity, Q330 Chan1
40 sps
BHN
Broadband Seismometer North ground velocity, Q330 Chan2
40
BHE
Broadband Seismometer East ground velocity, Q330 Chan3
40
LHZ
Broadband Seismometer Vertical ground velocity, Q330 Chan1
1
LHN
Broadband Seismometer North ground velocity, Q330 Chan2
1
LHE
Broadband Seismometer East ground velocity, Q330 Chan3
1
VHZ
from LHZ via VLP389, gain=1
0.1
VHN
from LHN via VLP389, gain=1
0.1
VHE
from LHE via VLP389, gain=1
0.1
UHZ
from VHZ via ULP379, gain=1
0.01
UHN
from VHN via ULP379, gain=1
0.01
UHE
from VHE via ULP379, gain=1
0.01
VEP
input voltage, 1count=150mV
0.1
VEC
system current, 1 count=1mA
0.1
VEA
GPS antenna current, 1 count=1mA
0.1
VKI
330 internal temp, 1 count=1 degree C
0.1
VCO
330 voltage controlled oscillator
0.1
VM1
Boom position ch1, 1 count=0.1V
0.1
VM2
Boom position ch2, 1 count=0.1V
0.1
VM3
Boom position ch3, 1 count=0.1V
0.1
LCQ
clock quality, in percent. See definition in Q330 MSEED description.
1
LCE
clock phase error from UTC in usec
1
VFP
percent of free packets in the DP4 queue
0.1
LTW
a byte of status bit information related to onsite conditions
1
VCE
from LCE via VLP389
0.1
VCQ
from LCQ via VLP389
0.1
VTW
from LTW via VLP389
0.1
ACE
Administrative Clock Error, a blog of clock messages
none
LOG
a text log of datalogger and baler messages
none
OCF
a daily binary snapshot of the q330 configuration
none
EP-LDM
absolute barometric pressure in hPa, MEMS sensor QEP onboard, Q330
1
EP-LKM
internal temperature inside VIE enclosure in degrees C, QEP onboard, Q330
1
EP-LIM
internal humidity inside VIE enclosure in percent, QEP onboard, Q330
1
EP-LEP
voltage supply, in volts, QEP onboard, Q330
1
EP-LCE
clock phase error relative to UTC, in usec, QEP onboard, Q330
1
EP-LCO
oscillator control value, QEP onboard, Q330
1
EP-BDO
absolute barometric pressure Setra 278 w/o 800 hPa offset, QEP ADC3 Chan1 Q330
40
EP-LDO
absolute barometric pressure Setra 278 w/o 800 hPa offset, QEP ADC3 Chan1 Q330
1
EP-BDF
infrasound microphone, relative barometric pressure,NCPA IFS-4532, QEP ADC3 Chan2, Q330
40
EP-LDF
infrasound microphone, relative barometric pressure,NCPA IFS-4532, QEP ADC3 Chan2, Q330
1

Additional channels for a Strong Motion sensor (Kinemetrics EST Episensor, 2g, 10V/g)

Channel
Description
Sample Rate
HNZ
Accelerometer, vertical ground acceleration, Chan 4 Q330
100 sps
HNN
Accelerometer, north ground acceleration, Chan 5 Q330
100
HNE
Accelerometer, east ground acceleration, Chan 6 Q330
100
LNZ
Accelerometer, vertical ground acceleration, Chan 4 Q330
1
LNN
Accelerometer, north ground acceleration, Chan 5 Q330
1
LNE
Accelerometer, east ground acceleration, Chan 6 Q330
1

Additional channels for a Vaisala WXT-520 weather station

Channel
Description
Sample Rate
EP-LWD
Wind Direction in degrees, Vaisala WXT520, QEP Q330
1 sps
EP-LWS
Wind Speed in 0.1 m/sec, Vaisala WXT520, QEP Q330
1
EP-LDV
Outdoor Pressure in 0.1 hPA, Vaisala WXT520, QEP Q330
1
EP-LKO
Outdoor Temperature in 0.1 deg C, Vaisala WXT520, QEP Q330
1
EP-LIO
Outdoor Humidity in 0.1 percent, Vaisala WXT520, QEP Q330
1
EP-LRO
Rain Intensity in 0.1 mm/hour, Vaisala WXT520, QEP Q330
1
EP-LRH
Hail Intensity in hits/cm**2*hour, Vaisala WXT520, QEP Q330
1
EP-LKH
Heater Temperature in 0.1 deg C, Vaisala WXT520, QEP Q330
1
EP-LEH
Heater Voltage in 0.1 V, Vaisala WXT520, QEP Q330
1
EP-LEW
Supply Voltage in 0.1 V, Vaisala WXT520, QEP Q330
1
EP-LER
Reference Voltage in 0.001 V, Vaisala WXT520, QEP Q330
1

Flexible Array

Flexible Array experiments are usually conducted like traditional IRIS PASSCAL experiments in that data is retrieved from the field at specific intervals, sent to the PASSCAL Instrument Center and finally shipped to the DMC. These data are available via all the DMC's traditional request mechanisms shortly after being received at the DMC with the access method dependent on the data type (either the SEED archive or Assembled data sets).

 

In some cases Flexible Array experiment data are telemetered in near-real time to the DMC in which case the data is managed similarly to Transportable Array, Reference Network or other real-time data feeds.

 

 

USArray Data Access Examples

This section is not intended to be an exhaustive tutorial for DMC data access, that function is served by the IRIS DMC Data Access Tutorial. Instead the purpose of these examples are to provide a brief illustration of and kickstart for data access.

 

Real-time data feeds:

The preferred method to get continuous, real-time data feeds from USArray stations is to use the IRIS DMC's SeedLink service. Note that most but not all USArray stations are delivered to the DMC in real-time.

 

SeedLink client software exists for Antelope, Earthworm, SeisComP and a command line client, slarchive, that will write Mini-SEED data directly into the directories and files of your chosing. In the case of Antelope and Earthworm, client programs are included with the recent releases, otherwise source code for client software can be found on the SeedLink service overview page.

 

BREQ_FAST and NetDC Request:

breq_fast is an email-based request mechanism. A user sends a formatted request to breq_fast at iris.washington.edu, after which the user is notified by email when the request is ready to download from the DMC. The breqfast format is described here.

 

As a simple example, requesting a 40-minute window of data from the LHZ channel of every TA network station could be done by sending the following in the body of an email to breq_fast at iris.washington.edu:

.NAME Joe Researcher
.EMAIL joe@university.edu
.MEDIA FTP
.LABEL TA-TongaEvent
.END
* TA 2006 05 03 15 30 00.0 2006 05 03 16 10 00.0 1 LHZ

Note that this request only includes the "TA" network stations (the stations installed by IRIS specifially for the Transporable Array). To request data from all Transportable Array stations including the shared and cooperative stations replace the "TA" network code with the "_US-TA" virtual network code.


NetDC Request is similar to breq_fast but allows users to request the data through a web page form.

 

Web Services

IRIS web services provides direct access to data and metadata archived at the DMC.

Sample queries:

http://www.iris.edu/ws/station/query?net=TA&startafter=2013-01-01&output=text


http://www.iris.edu/ws/availability/query?net=TA&cha=B*&start=2010-02-27T06:30:00.000&end=2010-02-27T10:30:00.000


http://www.iris.edu/ws/timeseries/query?network=TA&station=Z55A&location=--&channel=BHZ&starttime=2013-03-10T22:30:00&endtime=2013-03-11T02:00:00&bpfilter=0.01-0.1&output=plot