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Sheeted vein complex in Little Harbour, Catalina Island, California, USA. Folded blueschist in Little Canyon, Catalina Island, California, USA. Photo
Photo by John Paul Platt. by John Paul Platt.

Poster sessions will be held every evening between talks and include graywacke, pillow basalt, chert, and serpentinite, which
dinner, and will continue after dinner. Group discussions and have been variously metamorphosed under blueschist, high-pres-
breakout sessions will accompany all of the thematic sessions to sure greenschist, amphibolite, and eclogite-facies conditions at
promote cross-disciplinary interactions. One of the main goals of depths of 35–50 km and temperatures of 300–700 °C in the
the meeting is to provide a forum for geologists and geophysicists Mesozoic subduction zone along the western North American
to discuss how the existing information from the rock record margin. This range of depths and metamorphic temperatures
should be integrated with the geophysical insights, as well as what encompasses the likely range of conditions found in the source
new geological observations are needed to develop our under- areas for slow earthquakes on active margins such as Nankai or
standing of the physics of slow slip further. Cascadia, and beneath the Parkfield segment of the San Andreas
fault. Deformational features include block-in-matrix mélanges
PRELIMINARY AGENDA with sedimentary or ultramafic matrixes, as well as extensive
This five-day meeting will be held at the University of Southern tracts of coherent but strongly deformed rock showing polyphase
California Wrigley Institute for Environmental Studies, Santa folding, ductile shear zones, and a variety of deformational fab-
Catalina Island, California, USA. The meeting format will be rics. On Santa Catalina Island, the complex displays a variety of
a balance of invited talks, breakout discussions, pop-up talks, structural features that have been suggested as possibly associated
and poster presentations, with a day-long field trip on day three. with slow slip, including blocks of effectively rigid rock in a vis-
All nights will be spent at the Wrigley Institute. Participants cous matrix, sheeted vein complexes, and shear zones showing
will be expected to observe the GSA Code of Ethics & evidence for solution-redeposition creep associated with micro-
Professional Conduct (https://www.geosociety.org/ethics) folding and dilational cracking.
throughout the meeting.
The meeting will begin with a ferry ride to Santa Catalina ATTENDEES AND ESTIMATED COSTS
Island, followed by an icebreaker on the evening of day one Thanks to the generous support of the sponsoring agencies,
(27 June). Day two will focus on plenary talks presenting cutting- the majority of costs for the meeting are covered. The anticipated
edge observations of slow earthquake phenomena, as well as registration fee will be US$100. The registration fee will cover
mechanical insights from geophysical and numerical modeling four nights of lodging, meals, transportation to/from Santa
studies. Geological characteristics of potential slow earthquake Catalina Island, transportation for field trips, and facility usage.
sources will be introduced. Days four and five will involve a com- Participants will be expected to pay for travel expenses from their
bination of poster presentations, talks from participants, pop-up home to Southern California. However, we have funds to support
talks, panel discussions, and breakout groups to define hypotheses participant travel, which will be prioritized toward participants
regarding the geological mechanisms of slow earthquake slip and from underrepresented groups as well as early career and student
explore interdisciplinary collaborations to further our understand- participants. All participants will be expected to make their own
ing of slow earthquake phenomena. A return ferry will depart for travel arrangements to arrive at Long Beach, California, USA, in
the mainland targeting arrival around 5 p.m. for evening flight time for a scheduled ferry to the Wrigley Institute on Santa
departures from Los Angeles International Airport. Catalina Island.
Day three will be an all-day field trip for all participants, taking
in several exposures within about a 30–40-minute drive from the APPLICATIONS AND REGISTRATION
Wrigley Institute. Santa Catalina Island has extensive exposures Application period opens: 1 Sept. 2020
of a metamorphic complex of Cretaceous age that is generally con- Application deadline: 8 Jan. 2021
sidered to be part of the Franciscan Complex. Protolith rock-types Registration deadline: 5 Mar. 2021
www.geosociety.org/gsatoday 27