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CONSIDERATIONS FOR FUTURE SEISMIC SYSTEMS

CONSIDERATIONS FOR FUTURE SEISMIC SYSTEMS. Bob Nigbor USC. No Technological Barriers Exist to Real-Time, Automated Data Processing. Immediate Parametric Information Will Be the Expectation. Example: JMA Intensity Calc in SMA Firmware.

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CONSIDERATIONS FOR FUTURE SEISMIC SYSTEMS

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  1. CONSIDERATIONS FOR FUTURE SEISMIC SYSTEMS Bob Nigbor USC

  2. No Technological Barriers Exist to Real-Time, Automated Data Processing

  3. Immediate Parametric Information Will Be the Expectation Example: JMA Intensity Calc in SMA Firmware The JMA Intensity Calculation uses a special FIR filter the matches the passband of the SHINDOF instrument exactly. K = 1.75 Slope of top of filter f0 = 0.5 Hz Cut off frequency of high pass filter Fc = 10 Hz Cut off frequency of low pass filter Wn = [1 - exp[(-Fn/f0)3]]1/2 * (K/Fn)1/2 * 1/ [1 + 0.694 * (Fn/Fc)2 + 0.241 * (Fn/Fc)4 + 0.0557 * (Fn/Fc)6 + 0.009664 * (Fn/Fc)8 + 0.00134 * (Fn/Fc)10 + 0.000155 * (Fn/Fc)12]1/2 Figure 1 IJMA Bandpass FIR Filter Equation The JMA Intensity is calculated from the KAWASUMI equation IJMA = 2 * log(acceleration) + 0.7

  4. Future SMA’s Will Be Powerful The 3x3” UCSD/HPWREN CerfCube, the basis of a new strong motion monitoring concept that runs a Linux operating system, consists of a high-performance Intel StrongARM 1110 processor with 32 MB RAM and 16 MB Flash.

  5. Structural Monitoring Systems Will Be Powerful

  6. What Instrumentation Do We Need to Enhance/Improve Strong Motion Data? • What improvements in SMA’s are needed to eliminate “corrections” and allow automated processing? • What (non-acceleration) sensors are needed to get us closer to our engineering information needs?

  7. DIVERSE SENSING FOR STRONG-MOTION Uni-axial Accelerometer Tri-axial Accelerometer Rotation Sensor Pressure Cell and Sensor Displacement Transducer

  8. How Can Seismic Data=Strong Motion Data? • What can be done to make the low-gain components of seismic network data acceptable to our engineering needs? • How can our engineering needs drive the low-gain components of ground motion networks?

  9. Primary Participants or Secondary Data Users? • Products: • Engineering products • Emergency response products • Public Products • Other Waveform data & metadata Seismic Monitoring

  10. A Star Trek Future? Captain Kirk: Computer, what are the parameters of that earthquake on the planet? Computer: I’m sorry Captain, I must get my PhD’s together to process the data and develop a consensus. Come back in a few days.

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