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Experiment Support For any type of experiment, PASSCAL personnel assist PIs throughout the project to solve technical problems, including repairing instruments on site, troubleshooting problems remotely via telephone, and arranging shipments of replacement equipment (see Appendix F). In passive-source experiments, PASSCAL personnel arrive shortly after the equipment arrives in the field. They are responsible for testing and repairing any equipment that may have been damaged during shipping, and providing in situ training for field personnel. PASSCAL staff usually participate in some initial station deployments to provide additional PI training. Once this initial support is finished, the PIC will continue to support the PI during the experiment, either on site or remotely, as necessary. PASSCAL staff normally accompany active-source groups for their entire duration to ensure time-critical instrument deployments, to make repairs on instruments in the field, and to assist in the download of data and organization of metadata. Software Support The PASSCAL software suite comprises programs written over the last two decades by PASSCAL staff and the wider community. The primary function of PASSCAL software is to assist with collecting, performing quality control, and transforming data into optimal formats for analysis and archiving with the IRIS DMC. The software is primarily designed to support dataloggers provided by the PIC but has been used by many international institutions not associated with IRIS or PASSCAL. There are over 150 fully open-source programs ranging from simple command line programs, to graphical user interface scripts, to fully graphical data viewing programs. The suite also contains many user-contributed programs for performing tasks such as reading and writing miniSEED files and converting raw data to SEGY format. In-house Inventory/Maintenance Database Lab Tools Data Flow Purchasing Forms Software Development Team Waveform QC State-of-Health Analysis Archive Formatting of data & metadata Datalogger Interfacing User Community Data Transfer Tools Field-Specific QC Tools Datalogger Offload Tools Figure 29: PASSCAL software development serves both PASSCAL staff and the user community. Development both in-house and user-community software is a dynamic process reliant on user feedback. Functionality of the PASSCAL software suite can be roughly broken into two partially overlapping categories (Figure 29): in-house and user-community software. In-house software includes bench-testing utilities that allow PASSCAL staff to quickly and efficiently test multiple dataloggers and to update associated inventory and maintenance database. User-community software includes quality control code geared toward field and archiving applications. Examples of widely used software with overlapping in-house and user-community uses include waveform viewing tools, state-of-health analysis tools, and format conversion routines. PASSCAL provides pre-configured field computers containing the PASSCAL software suite as well as commercial programs that may be needed for a particular experiment. 32
Data Processing Support Prior to, during , and following an experiment, PASSCAL personnel work with the PI and staff responsible for archiving the data on the use of essential quality-control and processing tools (Figure 30). During passive experiments, PASSCAL personnel receive and verify preliminary SEED data, working closely with both the PI and DMC personnel to assure data and metadata completeness, accuracy, and quality. Verified SEED data sets from passive experiments are forwarded to the DMC for archiving as soon as possible, usually during the experiment. Active-source data are normally collated and verified following the experiment. A new archival data format, HDF-5, has recently been adopted so that active-source metadata can be corrected without having to re-archive the whole data set at the DMC. Software for archiving and retrieval is currently being tested. This software will provide the active-source experimentalists with a data-retrieval model similar to that for the passive experimentalists—the DMC acquires the data at an early stage, and maintains the waveform and metadata independently (see Appendix C). PASSCAL Experiment raw data metadata PI Archive ready SEED or SEGY ftp orb media PASSCAL/AOF Accept SEED data Delivery Verification Check SEED Veracity Archive ready SEED or SEGY Flexible Array Experiment PI raw data metadata ftp media orb raw data metadata Create datasync and update Sent db Bundle & Ship to DMC Archive ready SEED or SEGY ftp orb DMC bob Verify Delivery and Data Archiving Figure 30. Flow of data from the PI to the IRIS Data Management Center. 33
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Page 25 and 26: Program History PASSCAL Instrument
Page 27 and 28: Timeline 1984 ............... IRIS
Page 29 and 30: Multichannel Equipment Cable with S
Page 31 and 32: Box 1. Anatomy of a PASSCAL Experim
Page 33 and 34: Controlled-Source Instruments provi
Page 35 and 36: Support The number of instruments a
Page 37: FIELD QC1 FIELD_QC2 TRACKING Statis
Page 41 and 42: Shipments By Program (all methods)
Page 43 and 44: FORMS Instrument request forms PASS
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Page 51 and 52: Polar Approximately five to ten pro
Page 53 and 54: 25 20 Foreign Domestic Broadband Ex
Page 55 and 56: Box 3. PASSCAL Education and Outrea
Page 57 and 58: lower power that will be more appro
Page 59 and 60: Appendix A PASSCAL Standing Committ
Page 61 and 62: 4. The types and number of pieces o
Page 63 and 64: Appendix C PASSCAL Data Delivery Po
Page 65 and 66: Appendix D PI Acknowledgement PI AC
Page 67 and 68: Appendix F PASSCAL FIELD STAFFING P
Page 69: 2. Maintaining current lists of tra

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