title: Detection of regional infrasound signals using array data: Testing, tuning, and physical interpretation.
abstract: This work quantifies the physical characteristics of infrasound signal and noise, assesses their temporal variations, and determines the degree to which these effects can be predicted by time-varying atmospheric models to estimate array and network performance. An automated detector that accounts for both correlated and uncorrelated noise is applied to infrasound data from three seismo-acoustic arrays in South Korea (BRDAR, CHNAR, and KSGAR), cooperatively operated by Korea Institute of Geoscience and Mineral Resources (KIGAM) and Southern Methodist University (SMU). Arrays located on an island and near the coast have higher noise power, consistent with both higher wind speeds and seasonably variable ocean wave contributions. On the basis of the adaptive F-detector quantification of time variable environmental effects, the time-dependent scaling variable is shown to be dependent on both weather conditions and local site effects. Significant seasonal variations in infrasound detections including daily time of occurrence, detection numbers, and phase velocity/azimuth estimates are documented. These time-dependent effects are strongly correlated with atmospheric winds and temperatures and are predicted by available atmospheric specifications. This suggests that commonly available atmospheric specifications can be used to predict both station and network detection performance, and an appropriate forward model improves location capabilities as a function of time.
authors.affiliation: Roy M. Huffington Department of Earth Sciences, Southern Methodist University, P.O. Box 750395 Dallas, Texas 75275-0395, USA.
authors.forename: Junghyun
authors.initials: J
authors.lastname: Park
authors.affiliation: Roy M. Huffington Department of Earth Sciences, Southern Methodist University, P.O. Box 750395 Dallas, Texas 75275-0395, USA.
authors.forename: Brian W
authors.initials: BW
authors.lastname: Stump
authors.affiliation: Roy M. Huffington Department of Earth Sciences, Southern Methodist University, P.O. Box 750395 Dallas, Texas 75275-0395, USA.
authors.forename: Chris
authors.initials: C
authors.lastname: Hayward
authors.affiliation: Sandia National Laboratories, 1515 Eubank SE, Mail Stop 0404, Albuquerque, New Mexico 87123, USA.
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Arrowsmith
authors.affiliation: Korea Institute of Geoscience and Mineral Resources, 124 Gwahak-ro Yuseong-gu, Deajeon, 34132, Korea.
authors.forename: Il-Young
authors.initials: IY
authors.lastname: Che
authors.affiliation: Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA.
authors.forename: Douglas P
authors.initials: DP
authors.lastname: Drob