The objective of this workshop is to develop an application area database of exposure-age and related data aimed at measuring long-term rates of fault slip or other tectonic deformation. For the most part, these consist of surface exposure age data from faulted or folded landforms: for example, the distance the landform is offset along a fault, divided by the exposure age of the landform, gives the long-term slip rate of the fault.

This data set differs somewhat from existing ICE-D focus areas in that there exist quite a lot of cosmogenic-nuclide data that are not simple surface exposure ages; these include depth-profile data from fluvial or alluvial landforms as well as some burial-age data. Another difference is that estimating the age of a landform from exposure-age data is often more complex than for, e.g., glacial moraines, because many of these data are from nonglacial environments where nuclide inheritance is nearly always present.

On the other hand, it's an ideal application of the transparent-middle-layer concept because slip rate estimates based on cosmogenic-nuclide data from many major fault systems are distributed among numerous publications using different assumptions and calculation methods. Being able to look at all these data on a common basis with regard to (i) exposure-age calculations, (ii) inference of landform age from an exposure-age distribution, and (iii) inference of slip rate from landform age would be extremely valuable for synoptic analysis.

The workshop would focus on two main things:

First, compile enough surface exposure-age data related to active tectonics to have a large enough database for useful synoptic analysis. This involves training in how to interact with the data layer and enter/quality control existing data.

Second, develop middle-layer calculations for computing exposure ages, landform ages, and slip rates.

Additional goals would mainly include getting an idea of what non-exposure-age (depth-profile, BD) data exist as an aid to designing suitable middle-layer calculations.

Workshop participants should be researchers and students involved in generating or compiling cosmogenic-nuclide data having to do with Earth surface deformation. It is likely that the workshop will initially focus on the San Andreas fault system, so most participants will likely be from California or adjacent regions.

Date and location unknown, but likely in California in early 2022. Berkeley, Livermore, or SJSU possible.

A prototype 'ICE-D:TECTONICS' database and web server exists that contains only a few data, but demonstrates the principle of recording observational data about exposure ages and slip rates in the data layer and performing all calculations through to slip rate estimates in the middle layer.

An improved map interface would be really useful. Suggest discusion with OpenTopography to serve tiled LIDAR as a base layer?

A more structured way to plug calculations into the web server would be useful.

Some discussion with SCEC (Mike Oskin?) might be useful.