Thread: Alaska Transportable Array Station Affiliation Changes

Started: 2019-09-20 11:29:10
Last activity: 2019-09-20 11:29:10
Kasey Aderhold
2019-09-20 11:29:10
Dear IRIS Community,

A subset of Alaska Transportable Array stations are being transitioned to
operation by the Alaska Earthquake Center (AEC) at University of Alaska
Fairbanks. Data acquisition transfers for these 43 stations is ongoing
through October. Seismic data will still be archived and available via the
IRIS DMC, with a change of network code from TA to AK and a change in
sample rate from 40 sps to 50 sps. This might require adjusting data
retrieval scripts for the AK network code.

The 43 stations being transferred are located in southern, central and
southeast Alaska and include: H21K, H22K, H23K, H24K, I21K, I23K, I26K,
I27K, J17K, J19K, J20K, J25K, J26L, K20K, K24K, K27K, L18K, L19K, L20K,
L22K, L26K, M19K, M20K, M26K, M27K, N18K, N19K, O18K, O19K, O20K, P08K,
P16K, P17K, P23K , Q19K, Q23K, R16K, R18K, R32K, S31K, S32K, U33K, and
V35K. These are shown in yellow on the attached map.

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

- By October 2019, 43 stations will transfer to AK network code, leaving
151 to be operated by IRIS.
- Before May 1 2020, 18 additional stations installed primarily at
permanent observatories will be transitioned to other operators.
- On May 1 2020, all except 45 stations in the North Slope region (shown
as 2021 removals), will cease data collection and the Transportable Array
observation period will be over.
- By September 30 2020, the remaining 45 stations will either be:
- Adopted and transitioned to another operator.
- Telemetry discontinued and stations removed in summer 2021.

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 (

Leveraging collaborations with local, state, federal, and international
agencies has enabled the ongoing collection and dissemination of extremely
valuable and cross-disciplinary data from a sparsely-sampled region. An NSF
Dear Colleague Letter (19-048 - encourages proposals
for further repurposing the Alaska Transportable Array for environmental
observations in the Arctic.

IRIS would like to thank National Science Foundation (NSF) 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/OBSIP Management
202-407-7019 | kasey<at>

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