CSEP2 Community Responses

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Questionnaire

Questionnaire for CSEP Modelers

What are the scientific questions to be answered by experiments involving your model?

Model software requirements

Will the model be computed internal/external to CSEP? Required computing/memory/storage? Automated/On-demand? Versioned code? Status of code?

Object of forecast

Epicenters, Hypocenters, Faults? Cast as rates/probabilities, Sets of simulated catalogs? Forecast horizons, updates?

Required data inputs to compute forecast?

Authoritative data source for testing forecasts?

Available/unavailable tests, metrics etc. If unavailable, what scientific/computational developments need to occur to implement these tests?

Specific ideas for Retrospective/Prospective testing? Timescales?

Community involvement

competing models? New models/extant CSEP models?

Responses

These responses will act as living documents that we can refine as time progresses.

USGS Aftershock Forecasts

Response for the planned USGS routine aftershock forecasting. We will be rolling out Reasenberg & Jones forecasts in late August 2018, with ETAS forecasts to follow. Forecasts will be for aftershocks following M>=5 earthquakes, and smaller events of interest, within the US.

What are the scientific questions to be answered by experiments involving your model?

These forecasts are meant to inform the public and decision-makers, not to address any scientific questions. As we evolve from Reasenberg & Jones to ETAS, we will be able to tests these two models against each other.

Model software requirements

Will the model be computed internal/external to CSEP? Required computing/memory/storage? Automated/On-demand? Versioned code? Status of code?

Forecasts will be computed externally to CSEP. Currently on-demand,

but in the process of automating.

Object of forecast

Epicenters, Hypocenters, Faults? Cast as rates/probabilities, Sets of simulated catalogs? Forecast horizons, updates?

Forecast is cast as a PDF of the number of event hypocenters within a spatial region, time period, and magnitude range. There is no expectation that this PDF is any particular kind of distribution.

The ETAS forecasts will include something similar to a set of simulated catalogs, but not exactly. The forecasts are based on temporal simulated event sets, while a static spatial kernel is used to spatially distribute the event rate. So there are temporal simulated catalogs. Spatial-temporal simulated catalogs could be created using the spatial kernel, but wouldn't have the full level of spatial correlations of a true ETAS simulation.

Forecast horizons will range from 1 day to 1 year, and updating will occur frequently. Therefore, many forecasts will overlap, making them non-independent.

• Required data inputs to compute forecast?

Forecasts will be computed externally to CSEP.

• Authoritative data source for testing forecasts?

ComCat.

• Available/unavailable tests, metrics etc. If unavailable, what scientific/computational developments need to occur to implement these tests?

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• Specific ideas for Retrospective/Prospective testing? Timescales?

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• Community involvement: competing models? New models/extant CSEP models?

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