FOR LOWïºFREQUENCY SEISMOMETRY - IRIS

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Executive SummaryFor nearly a quarter of a century, the development of seismicsensors with low noise and high resolution in the normalmode frequency band (0.3-7 mHz) has languished. Theseismometer of choice for this field of seismology is now over20 years old, and is no longer being manufactured. Newersensors, albeit more portable and physically robust, more energyefficient, and less expensive, are less capable of recordingEarth motions in this frequency band. Over the same timeperiod, the training of seismic instrumentalists in departmentsof Earth science has languished; no longer do academicseismologists design and build new sensors. Outside of traditionalscience departments, however, a number of innovativeideas have been proposed for novel seismic instruments.In March 2004, <strong>IRIS</strong> sponsored a workshop on the futureof long-period seismometry, which brought together over 60participants from government, academic, and business sectorsof eight countries. Representatives of groups involved insensor technology, material sciences, and nanotechnologywere all present. The workshop’s goals were to assess emergingtechnologies that may have seismometric applicationsand formulate a plan to revitalize research and developmentof techniques in seismometry and related seismographic instrumentationin the United States.Workshop participants made several important observationsand recommendations:• The cornerstone sensor of the Global Seismographic Network(GSN), the Streckeisen STS-1, is aging and no longerin production. There are no sensors currently in productionor in development that match its performance.• Industry is unwilling to develop a substitute sensor forthis frequency band due to the anticipated unfavorablereturn on investment. (A total production run of 200units only is projected.)• Many workshop participants have come to believe thatthe goal to develop an all-purpose sensor, spanning thefrequency band from millihertz to decahertz, should beabandoned, and that two separate transducers shouldbe used to cover this range. Such a decision might easethe technological challenge and reduce the burden onindustry.• An innovative program involving academia, industry, andgovernment is recommended to nurture development ofthe next generation instruments and to educate the nextgeneration of US seismic system developers.• A program total of $10M-$20M over a period of 5-10years is envisioned.• Development needs to commence now to prevent significantdeterioration of the GSN over the next 5-10 years.1
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Page 5: ContentsExecutive Summary .........
Page 9 and 10: Box 2. Science Without Very Broadba
Page 11 and 12: RMS Acceleration in Octave Bandwidt
Page 13 and 14: 2.2. Seismic NetworksThe original s
Page 15 and 16: Figure 3. Frequency response of rep
Page 17 and 18: Table 2. GSN Sensor Requirements.Dy
Page 19 and 20: out changing the characteristics of
Page 21 and 22: 4. Testing and Test Facilities4.1.
Page 23 and 24: 5. Partnerships Between Industryand
Page 25 and 26: Benefit to academe:• Endowment.
Page 27 and 28: 7. AcknowledgementsWe would like to
Page 29 and 30: Appendix: Workshop AttendeesLast Fi
Page 32: THE INCORPORATED RESEARCHINSTITUTIO

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FOR LOWïºFREQUENCY SEISMOMETRY - IRIS