IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Gabi Laske Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics.

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Presentation transcript:

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Gabi Laske Cecil H. and Ida M. Green Institute of Geophysics and Planetary Physics La Jolla The Needs for/of Low-Frequency Seismology

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 * what is it good for? * what do we need? * what we usually see * some unexpected encounters * what is broad-band? * outlook Low-Frequency Seismology

What we look at

What is it good for?

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 * what is it good for? * what do we need? * what we usually see * some unexpected encounters * what is broad-band? * outlook Low-Frequency Seismology

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Lots of good seismograms at lots of stations What Do We Need?

Instrument Responses at New South Pole Station QSPA

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 * observatory quality instruments * high signal-to-noise * several days of continuous data What do we need?

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 An Example at GEOSCOPE Station SSB in France

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 But How Much Data is Fit for Our Studies

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Category “unload” Seismogram

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Category “unload” Seismogram

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Category “unload” Seismogram, if detected

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Calibration Signals, A NIGHTMARE!

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 * what is it good for? * what do we need? * what we usually see * some unexpected encounters * what is broad-band? * outlook Low-Frequency Seismology

well, of course STS-1/KS or so we think So, What Sensor Suits Us Best? but there is also

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 What Does This Imply for GSN etc? check all stations systematically!

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Average Scoring for 20 Greatest EQ of last 10 Years

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 So what does this mean? not sure…. might be that KS54000 are at noisy sites

Noise Spectra at New South Pole Station QSPA Courtesy Jon Berger/ Kent Anderson 10mHz 1 mHz STS-1 appears to be quietest

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 * what is it good for? * what do we need? * what we usually see * some unexpected encounters * what is broad-band? * outlook Low-Frequency Seismology

The Three Greatest Earthquakes in 2003

VHZ V: 10s H: High Gain Z: vertical The Three Greatest Earthquakes in 2003

Other Stations? Primary Sensor: STS-1 KS54000/KS36000 Secondary Sensor: STS-2 CMG3B/CMG3T

pretty noisy site!

LHZ L: 1s H: High Gain Z: vertical

only 3.6h of data at IRIS-DMC! LHZ L: 1s H: High Gain Z: vertical

! Quality of Spectra

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Global Seismology Where Do We Go From Here?

The Current Global Coverage of Global Seismic Networks

ORION Workshop, Jan 04-08, 2004, San Juan, Puerto Rico ION-Integrated Observatory Network (??) OSN-Ocean Seismic Network (OSN-1 in 98) interdisciplinary!

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 * some sensors at GSN near end of lifetime * there are still huge holes in the GSN Motivation for this Audience

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 * what is it good for? * what do we need? * what we usually see * some unexpected encounters * what is broad-band? * outlook Low-Frequency Seismology

The Importance of Recording 100s Rayleigh Waves

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 * what is it good for? * what do we need? * what we usually see * some unexpected encounters * what is broad-band? * a link to shorter periods * outlook Low-Frequency Seismology

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Data Logger Problems….A Thing of the Past?

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Data Logger Problems….A Thing of the Past?

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 This Is Really Significant to Tomography!

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 * reliable broad-band sensor (down to 1mHz) (for observatory-quality stations) * low-power/high dynamic range sensor for ocean bottom * reliable data flow to DMC * for temporary deployments: cheap/attractive 120s sensors (no 40s sensor) * need to be able to orient horizontal components easily * timing needs to be accurate Outlook So, What Do We Need?

IRIS Broad-Band Instrumentation Workshop; Lake Tahoe, Mar 24-26, 2004 Outlook So, What Do We Need? something that works like this … perhaps for VHZ!