Examining ambient noise using colocated measurements of rotational and translational motion   总被引：1，自引：0，他引：1  

Celine Hadziioannou  Peter Gaebler  Ulrich Schreiber  Joachim Wassermann  Heiner Igel 《Journal of Seismology》2012,16(4):787-796

In the past decade, a number of studies have reported the observation of rotational motion associated with seismic events. We report a first observation of rotational motion in the microseismic ambient noise band. A striking feature of rotational motion measurements is that the information about the seismic phase velocity and source back azimuth is contained in the amplitude ratio of a point measurement of rotation rate and transverse acceleration. We investigate the possibility of applying this method to ambient noise measured with a ring laser and a broadband seismometer at the Wettzell Geodetic Observatory in Germany. Using data in the secondary microseismic band, we recover local phase velocities as well as the back azimuth of the strongest noise source for two different time periods. In order to confirm these findings, we additionally compare the results with classical array processing techniques of the Gr?fenberg array located nearby.  相似文献   

Natural and Anthropogenic Sources of Seismic,Hydroacoustic, and Infrasonic Waves: Waveforms and Spectral Characteristics (and Their Applicability for Sensor Calibration)     

Schwardt  Michaela  Pilger  Christoph  Gaebler  Peter  Hupe  Patrick  Ceranna  Lars 《Surveys in Geophysics》2022,43(5):1265-1361

Surveys in Geophysics - The record of seismic, hydroacoustic, and infrasonic waves is essential to detect, identify, and localize sources of both natural and anthropogenic origin. To guarantee...  相似文献   

Parallel initial orbit determination using angles-only observation pairs     

Paul W. SchumacherJr.  John A. Gaebler  Christopher W. T. Roscoe  Matthew P. Wilkins  Penina Axelrad 《Celestial Mechanics and Dynamical Astronomy》2018,130(9):60

We propose a type of admissible-region analysis for track initiation in multi-satellite problems when angles are the primary observable. Pairs of optical observations are used to calculate candidate orbits via a Lambert solver by hypothesizing range values. The method is attractive because it allows multiple levels of parallelization of the track-initiation process. Orbital element partitions are introduced to divide the admissible region into smaller search spaces to be processed on individual computer nodes. For a specified rectangular partition in the space of orbital elements, constraints are developed to bound the values of range that will lead to initial orbit hypotheses (data association hypotheses) associated with that partition. These bounds allow us to parallelize the generation of candidate orbits, because each element-space partition can be handled independently of the others. Several constraints are developed and shown to limit the range pair hypotheses effectively to the constrained admissible region based on the orbital element partitions. Examples are provided to highlight the topology of the proposed constraints.  相似文献