50 years of global seismology: USGS Albuquerque Seismological Lab.

50 years of global seismology: USGS Albuquerque Seismological

Lab

GSNANSS The WWSSN

100+ analog station network 1962-1996 Provided data for monitoring nuclear

tests and seismological research Contributed to fundamental

observations to plate tectonics

GSNANSS GSN

GSNANSS

Iceland

KNTN - Kanton Island

KOWA - Mali

SAML - Brazil

QSPA - South Pole

Station examples

ENH - China

GSNANSS Then and now

Shallow seismic vaults


System assembly


Repair and testing


Instrument shop


Instrument testing


Data Quality Control

GSNANSS Instrumentation Wish List

• Low power Locations are often very remote

• Light weight Carrying heavy equipment long distances makes field

engineers grumpy

• Modular Useful to be able to send individual components

• Remote diagnostics Improved tools for troubleshooting sensors & data acquisition

units

• And …. inexpensive (Budgets are tight!)


Observational capabilities - sensors• GSN requires very broadband, low noise

sensor 360 s to 50 Hz Below GSN low-noise model 0.0005 to 10 Hz

• Currently use two sensors to cover the band of interest Increases expense … but provides a backup

• Some options for vault sensors on the horizon• Need improved borehole sensor performance

GSNANSS Exciting developments

Metrozet surface

vault sensor

Quanterra STS-2.5 deployed

in a borehole

UCSD iSeis


Observational capabilities – dataloggers• Option for 9- and 12- channel

systems • Wider range of calibration

frequencies• Robust telemetry support

Including TCP/IP Developments with Linux boxes

are interesting … but may create IT security issues

4 Q330s at QSPA

GSNANSS Instrumentation Pet Peeves

Cables and connectors• Reduce leakage

Need better sealed connectors

• Improve reliability Recent experience with a spate of bad cables (manufacturer-made)

• Increase flexibility Many cables are extremely stiff

• Thoughtful connector location Some locations are better for borehole/post

installation; others for surface sensor


Sensor orientation/leveling• Ease of orientation

Many different approaches: rods, feet, alignment pins

– Success depends on application

Some are easier than others – standardization desirable

Add a North-finding capability (export allowable)?

• Manufacturers need to specify accuracy:– Of axis orientation with respect to marks on the case– Of vertical orientation when the leveling bubble is

centered


Accuracy of sensitivity & transfer function• Manufacturers should specify accuracy

We have found problems with a number of sensors!

Retrievable parameters • Manufacturer name, model number, serial

number, and factory calibration parameters sufficient to reconstruct the sensitivity and transfer function of that particular sensor and/or data acquisition unit

50 years of global seismology: USGS Albuquerque Seismological Lab.

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