Thread: Alaska Transportable Array Station Removals and Data Telemetry Shutdown - May 1 2021

Started: 2021-04-27 15:38:27
Last activity: 2021-04-27 15:38:27
Dear IRIS Community,

The Transportable Array (TA) team plans to remove the remaining Alaska TA
stations this summer during the 2021 field season. This follows a
postponement due to local, state, and federal travel restrictions in
response to the pandemic and with the support of the National Science
Foundation (NSF). Data telemetry will cease on May 1, 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 AVO and AEC.
- 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 were 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.
- 5 stations that have been transferred will continue to be archived
under the TA network until a later transfer date (F28M, P32M, A36M, C36M,
- During the 2021 field season, all remaining non-transferred TA
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 transitioned to
other network operators. Seismic data from these transferred stations is
still 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 (

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 has been published in a focus
section of Seismological Research Letters in November and is available
online at: A longer format final report
is in preparation and will be made available at:

Scientific results from Alaska EarthScope have been featured in a weekly
seminar series this spring now culminating in a virtual workshop held May

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, 9am-5pm ET

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