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APPENDIX A CHARGE TO THE PANEL In 1994, the National Research Council convened the Pane! on Seismological Research Requirements for a Comprehensive Test-Ban Monitoring System to conduct a study requested by the Advanced Research Projects Agency (ARPA). The panel was to examine issues associated with establishing an International Seismic Monitoring System (ISMS) for verifying a Comprehensive Test-Ban Treaty (CTBT). Negotiations toward such a treaty are currently underway within the Conference on Disarmament (CD), with prototype versions of the ISMS being explored in a series of technical tests organized by the Group of Scientific Experts (GSE). The CTBT monitoring system being considered within the CD includes the acquisition and processing of data from high-quality stations and provision of the data to participating states to assist them in their national verification functions. ARPA has requested advice on how the data from the CTBT monitoring system might best benefit the broader seismological community. The NRC panel has been charged with considering specific data characteristics desired by the broad seismological community, procedures for providing general access to the ISMS data, and the nature of a research infrastructure that could best support CTBT monitoring. Many of the same considerations apply to the U.S. infrastructure for CTBT monitoring. The panel's task is su nmarized in three charges: Data Characteristics. The Group of Scientific Experts (GSE) has written draft requirements for an TSMS-standard station that specify characteristics such as sample rate, passband, dynamic range, and sensitivity. They have also proposed a Primary Station Network configuration and rough requirements for signal detection, parameter extraction, and event location. What types of data (raw and/or processed) are sought by the seismological community for use in test-ban monitoring research and in other types of basic research? 71
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72 Comprehensive Test Ban Monitoring System Data Access. The GSE has specified that all authorized users (most likely, the ISMS National Data Center in each participating country) have prompt electronic access (perhaps through the ISMS International Data Center) to all raw and processed data. What kind of access would best satisfy the requirements of other operational groups (e.g., for earthquake hazards and tsunami warning)? How should the data be organized (e.g., by region, station, time period; continuous vs. event segments) and made available (e.g., access time scales minutes or days; and media electronic or optical)? Research Feedback. An important aspect ofthe GSE concept is that the system can evolve. This includes regular improvement of the processing capabilities (e.g., travel-time and amplitude path corrections, enhancement of phase identification and event location, and new processing techniques). What is the best way to implement promising basic and applied seismic research within the GSE system? To what stage must research be taken (e.g., publication, algorithms, or finished software) to most expeditiously and reliably implement it into the system? What are the long-term national research and development programs required to support the envisaged monitoring system?