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Double-Difference Hypocenter Locations  \n(hypoDD version 1.0-03/2001)  \nby  \nFelix Waldhauser  \nU.S. Geol. Survey  \n345 Middlefield Rd, MS977 Menlo Park, CA 94025  \n[felix@andreas.wr.usgs.gov](felix@andreas.wr.usgs.gov)  \n[Open File Report 01-113](Open File Report 01-113)  \nThis report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards or with the North American Stratigraphic Code. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S.  \nGovernment.  \nTable of Contents  \nIntroduction and Overview ........................................................................................................................... 3  \nData Preprocessing Using ph2dt................................................................................................................... 4  \nEarthquake Relocation Using hypoDD......................................................................................................... 7  \nData Selection and Event Clustering....................................................................................................... 7  \nInitial Conditions and Solution Control .................................................................................................. 8  \nData Weighting and Re-weighting ........................................................................................................ 10  \nAnalysis of hypoDD Output ................................................................................................................... 12  \nError Assessment ................................................................................................................................... 13  \nReferences................................................................................................................................................... 13  \nAcknowledgements..................................................................................................................................... 14  \nAPPENDIX A. Reference for ph2dt ....................................................................................................... 15  \nA.1 Description..................................................................................................................................... 15  \nA.2 Installation and Syntax .................................................................................................................. 15  \nA.3 Input Files ...................................................................................................................................... 15  \nA.3.1 Control File (e.g. file ph2dt.inp) ............................................................................................ 15  \nA.3.2 Catalog (absolute) travel time data (e.g. file phase.dat) ....................................................... 16  \nA.3.3 Station location information (e.g. file station.dat) ................................................................. 17  \nA.4 Output Files ................................................................................................................................... 17  \nAPPENDIX B. Reference for hypoDD................................................................................................... 17  \nB.1 Description ..................................................................................................................................... 17  \nB.2 Installation and Syntax................................................................................................................... 17  \nB.3 Input Files ...................................................................................................................................... 17  \nB.3.1 Control File (e.g. file hypoDD.inp) ....................................................................................... 17  \nB.3.2 C","cbCaieq5JjHVGcEo","https://ap.wps.com/l/cbCaieq5JjHVGcEo","pdf",599228,25,"English","# Introduction and Overview\n# Data Preprocessing Using ph2dt\n# Earthquake Relocation Using hypoDD\n## Data Selection and Event Clustering\n## Initial Conditions and Solution Control\n## Data Weighting and Re-weighting\n# Analysis of hypoDD Output\n# Error Assessment\n# References\n# Acknowledgements\n# APPENDIX A. Reference for ph2dt\n## Description\n## Installation and Syntax\n## Input Files\n## Output Files\n# APPENDIX B. Reference for hypoDD\n## Description\n## Installation and Syntax\n## Input Files\n## Output Files\n# APPENDIX C. Utility Programs","[{\"question\":\"What problem does hypoDD solve in earthquake studies?\",\"answer\":\"hypoDD is designed to compute earthquake hypocenter locations using a double-difference method, improving relocation based on differential information.\"},{\"question\":\"What are the main workflow stages described in the report?\",\"answer\":\"The report covers data preprocessing with ph2dt, earthquake relocation using hypoDD, data selection and event clustering, then initialization, solution control, and weighting/re-weighting.\"},{\"question\":\"What information is provided about running ph2dt and hypoDD?\",\"answer\":\"Appendix A and Appendix B provide references including descriptions, installation and syntax, and detailed input and output file specifications for ph2dt and hypoDD.\"}]","hypoDD - A Program to Compute Double-Difference Hypocenter Locations - Open File Report 01-113 | PDF",63]