Thread: Alaska Transportable Array Station Affiliation Changes

Started: 2020-09-18 16:34:47
Last activity: 2020-09-18 16:34:47
2020-09-18 16:34:47
Dear IRIS Community,

The Transportable Array team planned to remove the remaining Alaska TA
stations this summer during the 2020 field season. Due to local, state, and
federal travel restrictions in response to the pandemic and with the
support of the National Science Foundation (NSF), IRIS postponed removal of
most of these stations to the 2021 field season. Data telemetry will
continue until May 2021 and the Array Network Facility (ANF) will continue
to support archival at the IRIS DMC along with processing onsite baler
media as it is returned from removals.

The timeline of operations, transitions, and removals for the Alaska TA
stations is being executed as follows:

- In Fall 2019, 43 stations were transferred to the AEC under the AK
network code, leaving 151 to be operated by IRIS.
- By May 1 2020, 24 additional stations were transitioned to other
- During the 2020 field season, all remaining stations continued to be
operated with data telemetry and archival at the IRIS DMC.
- Limited station removals were done while adhering to all local,
state, and federal travel restrictions as well as employing a limited
contact strategy developed specifically for the Alaska TA project.
- By September 30 2020, 45 stations will be transferred to the AEC under
the AK network code as part of a funded award in response to the 19-048
NSF Dear Colleague Letter (
- On May 1 2021, telemetry will be turned off of the remaining stations
and real-time data collection will cease.
- During the 2021 field season, all remaining stations will be removed.
All baler media returned before September 1 2021 will be processed at ANF.

A subset of Alaska Transportable Array stations have been or are in the
process of being transitioned to other network operators. Seismic data will
still be archived and available via the IRIS DMC, *with a change of network
code* and, in some cases, *a change in sample rate or channel/location
code*. This
might require adjusting data retrieval scripts. The full list of adopted or
continuing Transportable Array stations is available under the virtual
network _US-TA-ADOPTED ( Note that this will be
updated to include stations as their data acquisition is transferred.

Station hosts and the public can view data in webicorder or event views
from stations or locate the nearest station with real-time data using the IRIS
Station Monitor app (

A paper on the Alaska Transportable Array will be published in a focus
section of Seismological Research Letters in November and is already
available online at: A longer format
final report is in preparation and will be made available at:

IRIS would like to thank the National Science Foundation for their
continued support of the Alaska Transportable Array project through NSF
Award EAR-1261681.

- Bob Busby and the Transportable Array Team


Kasey Aderhold, Ph.D.
Project Associate | IRIS TA/IS Management
202-407-7019 | kasey<at> | (she/her)
Currently teleworking M-F, 10am-6pm ET

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