CONCLUSION REFERENCES 8 High‐Resolution Shallow Structure at Brady Hot Springs Using Ambient Noise Tomography (ANT) on a Trenched Distributed Acoustic Sensing (DAS) Array 8.1. INTRODUCTION 8.2. DATA AND METHODS 8.3. NCF RESULTS 8.4. DISPERSION MEASUREMENT RESULTS 8.5. SHEAR WAVE VELOCITY MODEL 8.6. CONCLUSIONS ACKNOWLEDGMENTS REFERENCES
10 Part III: Distributed Acoustic Sensing (DAS) Applications in Monitoring of Deformations, Earthquakes, and Microseisms by Fracturing 9 Introduction to Interferometry of Fiber‐Optic Strain Measurements 9.1. INTRODUCTION 9.2. SENSITIVITY OF DAS TO FAR‐FIELD SOURCES 9.3 Sensitivity of DAS Cross‐Correlations to Plane Wave Sources 9.4. THOUGHT EXPERIMENT DEMONSTRATING AMBIENT NOISE INTERFEROMETRY TRENDS 9.5. SIMULATED AMBIENT NOISE INTERFEROMETRY ALONG CABLES 9.6. CONCLUSIONS ACKNOWLEDGMENTS REFERENCES 10 Using Telecommunication Fiber Infrastructure for Earthquake Monitoring and Near‐Surface Characterization 10.1. INTRODUCTION 10.2. THE SFSO 10.3. CONTINUOUS MONITORING AND ANALYSIS OF LOCAL AND REGIONAL EARTHQUAKES 10.4. CONTINUOUS MONITORING OF NEAR‐SURFACE CONDITIONS BY INTEFEROMETRY 10.5. IS THE COUPLING BETWEEN CABLES AND THE GROUND THE LIMITING FACTOR? 10.6. PROCESSING CHALLENGES FOR LARGE DAS ARRAYS IN URBAN ENVIRONMENTS 10.7. CONCLUSIONS ACKNOWLEDGMENTS REFERENCES 11 Production Distributed Temperature Sensing versus Stimulation Distributed Acoustic Sensing for the Marcellus Shale 11.1. INTRODUCTION 11.2. METHODOLOGY 11.3. RESULTS AND DISCUSSIONS 11.4. CONCLUSIONS ACKNOWLEDGMENTS REFERENCES 12 Coalescence Microseismic Mapping for Distributed Acoustic Sensing (DAS) and Geophone Hybrid Array: A Model‐Based Feasibility Study 12.1. INTRODUCTION 12.2. DAS SYNTHETIC DATA FORMICROSEISMIC EVENTS 12.3. THE LOCATION ALGORITHM FORDAS-GEOPHONE HYBRID ARRAY 12.4. TESTS 12.5. DISCUSSION AND CONCLUSION REFERENCES
11 Part IV: Distributed Acoustic Sensing (DAS) Applications in Environmental and Shallow Geophysics 13 Continuous Downhole Seismic Monitoring Using Surface Orbital Vibrators and Distributed Acoustic Sensing at the CO2CRC Otway Project: Field Trial for Optimum Configuration 13.1. INTRODUCTION 13.2. PERMANENT MONITORING AT THECO2CRC OTWAY PROJECT 13.3. FIELD EXPERIMENTS WITH DAS AND SOV SOURCES AT THE CO2CRC OTWAY PROJECT 13.4. OFFSET VSP PROCESSING 13.5. MAY 2017 FIELD TRIAL: CONVENTIONAL SINGLE‐MODE FIBER VS. CONSTELLATION FIBER 13.6. NOVEMBER 2017 FIELD TRIAL: PERFORMANCE OF SMALL AND LARGE MOTORS 13.7. SUMMARY AND CONCLUSIONS ACKNOWLEDGMENTS REFERENCES 14 Introduction to Distributed Acoustic Sensing (DAS) Applications for Characterization of Near‐Surface Processes 14.1. INTRODUCTION 14.2. CONSIDERATIONS FOR DEPLOYMENTS 14.3. SPECIFIC TOPICS IN THIS CHAPTER 14.4. CONCLUSIONS REFERENCES 15 Surface Wave Imaging Using Distributed Acoustic Sensing Deployed on Dark Fiber: Moving Beyond High‐Frequency Noise 15.1. INTRODUCTION 15.2. DARK FIBER NETWORKS: THE ESNET DARK FIBER TESTBED 15.3. STUDY SITE AND DATA ACQUISITION 15.4. DATA CHARACTERISTICS AND ANALYSIS OF NOISE SOURCES 15.5. PROCESSING STRATEGY 15.6. RESULTS