We will miss seeing all of you in person this year but hope we can still connect virtually to share the latest developments in our seismic monitoring solutions. To book a time to catch-up please contact us and we can setup a meeting.
A Science and Archive Ready Digital Data Recording System for Interdisciplinary Environmental Research (S021-0018) - Poster
Presenter: Nick Pelyk
Date/ Time: Wednesday, 9 December 2020 - 07:00 - 23:59 ET (04:00 - 20:59 PT)
Seismic Instrumentation Latency and Associated Design Trade-offs in Earthquake Early Warning Systems (S046-0012) - Poster
Presenter: Michael Laporte
Date/ Time: Monday, 14 December 2020 - 07:00 - 23:59 ET (04:00 - 20:59 PT)
New Capabilities in Polar Qualified Very Broadband Seismic Instrumentation (C032-01) - E-Presentation
Presenter: Tim Parker
Date/ Time:Thursday, 10 December 2020 - 13:30 - 13:33 ET (10:30 - 10:33 PT)
AGU 2020 Abstracts
A Science and Archive Quality Digital Data Recording System for Interdisciplinary Environmental Research
In the 2008 IRIS Community publication Seismological Grand Challenges in Understanding Earth’s Dynamic Systems the report laid out societal environmental challenges that seismology can address but noted that an interdisciplinary approach was needed to fully take advantage of seismology’s significant contribution. The choices back then were stark for researchers wanting low powered simple digital scientific grade records of analog signals, either an expensive and large broadband seismic recorder requiring more power and logistics or go the other route and find or make an inexpensive recorder with not well-defined timing, gain, response, reliability or support. The newest Nanometrics digitizer, the Pegasus and its ecosystem is designed for optimum SWaP (size, weight and power) while still low noise enough to be used with observatory grade seismic sensors. The Pegasus (.2 watts), as an example, can be coupled with low power sensors such as a Trillium Compact Horizon (.18 watts) to create a node size broadband system, that requires under .4 watts, that is easily transportable (< 1.75kg) and creates standard miniseed archive ready data sets and complete station XML. Important for scientists new to seismology where science programs require a proposal data plan and easily shared archived data that can leverage all the time series tools. These lightweight and environmentally rugged types of systems are ideal for deploying in remote environments with enough data storage for recording continuously up to three years at 100sps. The Pegasus digitizers have both four 24 bit channels and three 16 bit SOH channels and are rated for both very wet and polar environments. With a wide range of sample rates and gains for integrating with many types of analog sensors, it is a system capable of supporting a multidisciplinary approach in the field comparable to the best attributes of an oil and gas type node but with much more capability. Downloading is via USB3 to either a ruggedized solid state drive or laptop at a data rate of ~1 month every 10 seconds for standard broadband recording rates. They are easily reconfigured in the field as required with the Pegasus phone application and if part of a large network there is a campaign manager application available to keep configurations recorded and verified or can be used for planning an experiment.
The 2003 SEAP (The Structure and Evolution of the Antarctic Plate) conference in Boulder, Colorado produced an influential report, ”Antarctica Array: A Unique Perspective on the changing Earth”. SEAP laid out an ambitious vision of seismic and geodetic arrays to study the Antarctic plate and its structure and evolution, and the Antarctic seismological environment using components and approaches influenced by the concurrent planning of EarthScope. Elements addressing SEAP science motivations were funded by NSF and substantial improvements in year-round data return were realized by the time of the 2007-2009 IPY (International Polar Year) and thereafter. However, these engineering improvements in power, (limited) telemetry, and deployment systems have taken many years to achieve reliability and data quality metrics that are comparable to those of lower latitude deployments. Recently developed broadband seismic systems have much wider bandwidth, lower self-noise, and greatly reduced SWaP (size, weight, and power). These instruments provide the opportunity to realize higher-density high quality modern data acquisition that is relevant to solid Earth, glaciological, and/or climate-related studies, and to broadly further the autonomous and real time collection of extremely low noise observations in polar regions. We will discuss these new instruments, and their capabilities and possibilities in the context of further improving present polar instrument pools to address SEAP Conference and other polar science initiatives that have not yet been realized.
Seismic Instrumentation Latency and Associated Design Trade-offs in Earthquake Early Warning Systems
Low latency is a key contributor to the success of an Earthquake Early Warning (EEW) system. There are several points where delay is introduced between the instant in time that a digitizer produces a set of samples across its analog sensor channel inputs and the point at which the corresponding data reaches its destination for EEW processing. These points of delay arise out of software, mathematical, and networking as well as physical constraints imposed upon the digitizer and associated communication systems.
We examine factors associated specifically with seismic instrumentation selection and configuration, and their practical impact on real-world EEW performance. System designers and network operators must be fully aware of latency and its contributors in order to make the right configuration choices when commissioning EEW systems to ensure the lowest possible latency without compromising the accuracy of the early warning data product.