ALBERT

Note: Contents List of Contributors Preface Chapter 1 An Introduction to the Ocean Soundscape 1.1 Introduction 1.2 Seismic Waves 1.2.1 Body Waves 1.2.2 Surface Waves 1.3 Noise Sources in the Oceans 1.3.1 Noise from Geological Origins (Geophony) 1.3.2 Noise from Biological Origins (Biophony) 1.3.3 Noise from Anthropogenic Origins (Anthrophony) 1.4 Tools for Recording Marine Noise 1.4.1 Ocean-Bottom Seismometers 1.4.2 Ocean-Bottom Nodes 1.4.3 Ocean-Bottom Observatories 1.4.4 Acoustic Doppler Current Profilers 1.4.5 Echosounders 1.4.6 Drifters and Floats 1.5 Common Data-Processing Methods 1.5.1 Time-Drift Correction 1.5.2 Data Reduction 1.5.3 Instrument Relocation through Travel-Time Analysis 1.5.4 Rotation for Geophone Reorientation 1.5.5 Converting from Counts to Physical Units 1.5.6 Removing the Mean from the Data Set 1.5.7 Frequency Spectrum, Spectrogram, and Power Spectral Density 1.5.8 Frequency Filtering 1.5.9 Polarization Analysis 1.6 Summary of Chapters 1.7 Future Developments of Acoustic Measurements in the Ocean References Chapter 2 Seismic Ambient Noise: Application to Taiwanese Data 2.1 Introduction 2.2 Background Ambient Seismic Noise in Taiwan 2.3 Ambient Seismic Noise Generated by Intense Storms 2.4 Deepsea Internal Waves Southeast of Offshore Taiwan 2.5 Gas Emissions at the Seafloor and "Bubble" SDEs in SW Offshore Taiwan 2.6 Conclusion Acknowledgments References Chapter 3 Seasonal and Geographical Variations in the Quantified Relationship Between Significant Wave Heights and Microseisms: An Example From Taiwan 3.1 Introduction 3.2 Method and Data Processing 3.2.1 Data 3.2.2 Method 3.3 Testing and Determining Parameters 3.4 Results and Discussion 3.4.1 Seasonal Variation 3.4.2 Geographical Variation 3.4.3 Residual Distributions of the SHW Simulation 3.5 Conclusions -- Acknowledgments References Chapter 4 Listening for Diverse Signals From Emergent and Submarine Volcanoes 4.1 Introduction 4.2 Detection and Monitoring of Submarine Volcanism 4.2.1 Hydroacoustic Arrays 4.2.2 Seismometer Arrays 4.2.3 Cabled Systems 4.2.4 Limitations in Detecting Submarine Volcanism 4.3 Diverse Volcano Signals Recorded Underwater 4.3.1 Distinguishing Signal from Noise in the Ocean 4.3.2 High-Frequency Volcanic Signals 4.3.3 Low-Frequency Volcanic Signals 4.3.4 Volcanic Tremor Signals 4.3.5 Volcanic Explosion-Type Signals 4.3.6 Volcanic Landslide Signals 4.4 Conclusions Availability Statement Acknowledgments References Chapter 5 Seismic and Acoustic Monitoring of Submarine Landslides: Ongoing Challenges, Recent Successes, and Future Opportunities 5.1 Introduction 5.1.1 Recent Advances in Direct Monitoring of Submarine Landslides 5.1.2 Aims 5.2 Passive Geophysical Monitoring of Terrestrial Landslides 5.3 Which Aspects of Submarine Landslides Should We Be Able to Detect with Passive Systems? 5.4 Recent Advances and Opportunities in Passive Monitoring of Submarine Landslides 5.4.1 Determining the Timing and Location of Submarine Landslides at a Margin Scale Using Land-Based Seismological Networks 5.4.2 Quantifying Landslide Kinematics Using Hydrophones 5.4.3 Characterizing Landslide Run-Out to Enhance Hazard Assessments 5.4.4 Opportunities Using Distributed Cable-Based Sensing 5.5 The Application of Passive Geophysical Monitoring in Advancing Submarine Landslide Science 5.5.1 Can Passive Seismic and Acoustic Techniques Overcome the Logistical Challenges That Have Previously Hindered the Monitoring of Submarine Landslides? 5.5.2 What Aspects of Submarine Landslides Can We Assess from Passive Remote Sensing Techniques, and What Needs To Be Resolved? 5.5.3 Suggestions for Future Directions 5.6 Concluding Remarks Acknowledgments References Chapter 6 Iceberg Noise 6.1 Introduction 6.2 Waveforms of Iceberg Noise 6.2.1 Iceberg Bursts 6.2.2 Iceberg Tremor 6.2.3 Iceberg Harmonic Tremor 6.3 Observation and Location of Iceberg Noise 6.3.1 Hydroacoustic Records at Long Distances 6.3.2 Records of Regional Hydroacoustic Networks 6.3.3 Seismic Records in Antarctica 6.4 Spatial and Temporal Variations of Iceberg Noise 6.5 Source Mechanisms of Iceberg Noise 6.6 Discussion 6.7 Conclusion Acknowledgments References Chapter 7 The Sound of Hydrothermal Vents 7.1 Introduction 7.2 Theory of Sound Production by Hydrothermal Vents 7.2.1 Radiation Efficiency 7.2.2 Monopole 7.2.3 Dipole 7.2.4 Quadrupole 7.2.5 Estimated Source Sound Pressure Levels 7.2.6 Estimated Source Spectra 7.3 Survey of Acoustic Measurements 7.3.1 Very Low Frequency (〈 10 Hz) 7.3.2 Narrowband 7.3.3 Broadband 7.3.4 Tidal Variability 7.3.5 Summary of Acoustic Measurements 7.4 Other Sources of Ambient Noise 7.4.1 Microseisms 7.4.2 Local and Teleseismic Events 7.4.3 Biological Sources 7.4.4 Anthropogenic Sources 7.5 Measurement and Analysis Considerations 7.5.1 Flow Noise and Coupled Vibration 7.5.2 Sound Speed in Hydrothermal Fluid 7.5.3 Near Field vs Far Field 7.5.4 Hydrophone Array Measurements 7.6 Conclusion Nomenclature References Chapter 8 Atypical Signals: Characteristics and Sources of Short-Duration Events 8.1 Introduction 8.2 Signal Characteristics 8.3 Worldwide Distribution of SDEs 8.4 Observations and Studies Advancing SDE Understanding 8.4.1 Observations from Different Types of Ocean Bottom Instruments 8.4.2 Continuous Long-Term, Multidisciplinary Monitoring of Gas Emissions 8.4.3 Correlation with Acoustic Monitoring of Gas Emissions 8.4.4 Correlation with Earthquakes 8.4.5 Correlation with Tides 8.4.6 Controlled in situ and Laboratory Experiments 8.5 Discussion of SDE Potential Sources 8.5.1 Biological Origin 8.5.2 Action of Ocean/Sea Currents 8.5.3 Fluids in Near-Surface Sediments 8.5.4 Low-Magnitude Seismicity 8.5.5 Source Modeling 8.6 Conclusion Acknowledgments References Chapter 9 Short-Duration Events Associated With Active Seabed Methane Venting: Scanner Pockmark, North Sea 9.1 Introduction 9.2 Scanner Pockmark Complex 9.3 CHIMNEY Seismic Experiment 9.4 Methods 9.5 Results 9.6 Discussion 9.6.1 Characteristics of SDEs 9.6.2 Spatial Distribution of SDEs 9.6.3 Negative Correlation with the Tide 9.6.4 Efficiency of SDE Detection 9.7 Conclusion Acknowledgments References Chapter 10 Ambient Bubble Acoustics: Seep, Rain, and Wave Noise 10.1 Introduction 10.2 Bubbles as Acoustic Sources 10.2.1 The Injection of a Gas Bubble 10.2.2 Bubbles as Simple Harmonic Oscillators 10.2.3 Minnaert Frequency 10.3 Subsurface Gas Release 10.3.1 Gas-Seep Acoustics 10.4 Rainfall Acoustics 10.5 Acoustics of Breaking Waves 10.6 Conclusion Further Reading Appendix Symbology References Chapter 11 Baleen Whale Vocalizations 11.1 Introduction 11.1.1 Marine Mammal Classification 11.2 Physical Description of Sound and Its Conventions 11.2.1 Sound Pressure Level (SPL) 11.2.2 Source Level (SL) 11.2.3 Whale-Sound Analysis 11.3 Marine Mammal Vocalizations 11.3.1 Sirenia and Carnivora 11.3.2 Toothed Whales 11.3.3 Baleen Whales 11.4 Conclusions Acknowledgments References Chapter 12 Tracking and Monitoring Fin Whales Offshore Northwest Spain Using Passive Acoustic Methods 12.1 Introduction 12.1.1 Passive Acoustic Monitoring 12.1.2 Fin Whale Vocalizations 12.1.3 Data Available for This Study 12.2 Methods 12.2.1 Call Detection 12.2.2 Delay Estimation 12.2.3 Localization and Tracking 12.2.4 Kalman Filter 12.3 Results 12.3.1 Detections 12.3.2 Localization 12.3.3 Tracking 12.4 Discussion 12.5 Conclusions Acknowledgments References Chapter 13 Noise From Marine Traffic 13.1 Introduction 13.2 Underwater Radiated Noise 13.2.1 Sources of Shipping Noise 13.2.2 Measuring Radiated Noise 13.2.3 Modeling Underwater Radiated Noise 13.3 Noise Mapping 13.3.1 Modeling Shipping Contributions 13.3.2 Source Properties 13.3.3 Acoustic Propagation 13.3.4 Noise-Mapping Applications 13.4 Conclusion Acknowledgments References Chapter 14 Tracking Multiple Underwater Vessels With Passive Sonar Using Beamforming and a Trajectory PHD Filter 14.1 Introduction 14.2 Narrow-Band Signal Model 14.3 Detection via Beamforming and CA-CFAR 14.3.1 CBF 14.3.2 CA-CFAR 14.4 T