Issues

FOCUS SECTION
Preface to the Focus Section on Geophone Array Seismology
Laboratory Tests of Three Z‐Land Fairfield Nodal 5‐Hz, Three‐Component Sensors
Persistent Noise Signal in the FairfieldNodal Three‐Component 5‐Hz Geophones
The Source Physics Experiments Large Array
Active‐Source Seismic Tomography at the Brady Geothermal Field, Nevada, with Dense Nodal and Fiber‐Optic Seismic Arrays
Induced Seismicity Characterization during Hydraulic‐Fracture Monitoring with a Shallow‐Wellbore Geophone Array and Broadband Sensors
Long‐Period Long‐Duration Events Detected by the IRIS Community Wavefield Demonstration Experiment in Oklahoma: Tremor or Train Signals?
Microseismic Event Detection Using Multiple Geophone Arrays in Southwestern Utah
The 2017 Jiuzhaigou Earthquake Aftershock‐Monitoring Experimental Network: Network Design and Signal Enhancement Algorithm
Structure of the Northern Los Angeles Basins Revealed in Teleseismic Receiver Functions from Short‐Term Nodal Seismic Arrays
Imaging the Topography of Crust–Mantle Boundary from a High‐Density Seismic Array beneath the Middle‐Lower Yangtze River, Eastern China
Reflections from the Inner Core Recorded during a Regional Active Source Survey: Implications for the Feasibility of Deep Earth Studies with Nodal Arrays
Upper‐Crustal Shear‐Wave Velocity Structure of the South‐Central Rio Grande Rift above the Socorro Magma Body Imaged with Ambient Noise by the Large‐ Sevilleta Seismic Array
Shallow Imaging of the Groningen Area from Joint Inversion of Multimode Surface Waves and H/V Spectral Ratios
ARTICLES
The Namche Barwa Temporary Seismic Network (NBTSN) and Its Application in Monitoring the 18 November 2017 M 6.9 Mainling, Tibet, China, Earthquake
Seismological Constraints on the Source Mechanism of the Damaging Seismic Event of 21 August 2017 on Ischia Island (Southern Italy)
The Seismicity of Ischia Island
The 2016 6.5 Pidie Jaya, Aceh, North Sumatra, Earthquake: Reactivation of an Unidentified Sinistral Fault in a Region of Distributed Deformation
Source Study of the 24 August 2016 6.8 Chauk, Myanmar, Earthquake
Determination of Local Magnitude Distance Corrections for Northern Oklahoma
Measurement and Interpretation Uncertainty in Site Response of Nine Seismic Network Stations in Israel
Modeling of Colombian Seismicity as Small‐World Networks
Interference of Teleseismic Body Waves in Noise Cross‐Correlation Functions in Southwest China
The Detection of Wind‐Turbine Noise in Seismic Records
A Self‐Noise Model for the German DEPAS OBS Pool
The Mexican Earthquake Source Parameter Database: A New Resource for Earthquake Physics and Seismic Hazard Analyses in Mexico
ELECTRONIC SEISMOLOGIST
A Repeating Event Sequence Alarm for Monitoring Volcanoes
The Source‐Specific Station Term and Waveform Cross‐Correlation Earthquake Location Package and Its Applications to California and New Zealand
SKATE: A Web‐Based Seismogram Digitization Tool
HISTORICAL SEISMOLOGIST
A Pioneering Aftershock Study of the Destructive 4 January 1920 Jalapa, Mexico, Earthquake
COMMUNICATING SCIENCE
Communicating Science to Politicians
EDUQUAKES
Football Quakes as a Tool for Student Engagement
Tilt Trivia: A Free Multiplayer App to Learn Geoscience Concepts and Definitions
DATA MINE
The 2015 Sevilleta Socorro Magma Body Mixed‐Mode Seismic Experiment
A Community Experiment to Record the Full Seismic Wavefield in Oklahoma
SSA ANNUAL MEETING REPORT
2018 SSA Annual Meeting Report
SSA ANNUAL MEETING ANNOUNCEMENT
2019 Annual Meeting Announcement
EASTERN SECTION
Discriminating between Low‐Magnitude Shallow Earthquakes and Road Construction Blasts near Big Salmon River, New Brunswick, Canada
The 2017 Barrow Strait, Arctic Canada, Earthquake Sequence and Contemporaneous Regional Seismicity
MEETING CALENDAR
Meeting Calendar
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Cover Image
Cover Image
Front: Stand-alone geophones have been used for decades within the active-source seismic community, but recent technological advances in geophone instrumentation have made it possible to use them for a wide range of passive seismic studies as well. The SRL Focus Section on Geophone Array Seismology (this issue) comprises 13 articles that present investigations into geophone instrumentation, active-source imaging and explosion physics, local seismicity and aftershocks monitoring, and receiver function and ambient noise imaging with dense arrays. Shown here are a deployment of nodal seismometers in Salt Lake City with seven collocated pairs of surface and buried nodes (red circles) with different gain settings (lower left, from Farrell et al., this issue); horizontal shake-table tests for a sensor (upper right, from Ringler et al., this issue); as well as a student preparing a hole for installation of a node (upper left) and students orienting a three-component 5 Hz node during installation at a gradiometer site (lower right), both from Sweet et al. (this issue).
Back: In 2016, students from the geology department at Leicester University used simple low-frequency geophones and low-cost seismic dataloggers set up in a primary school and a local museum to record crowd-induced vibrations at King Power Stadium, home of the Leicester City Football Club, a professional soccer team in the English Premier League. Clear signals were detected every time the home team scored a goal, which students dubbed “Vardyquakes” on social media after the team’s star striker, Jamie Vardy. After a student-led social media campaign, the story went viral in the mainstream media. Denton et al. (this issue) documents the project and notes that its real success was in finding an engaging and reliable tool for encouraging university students to participate in seismologyrelated outreach activities with younger local students and their community.
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