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 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 f 0 = 0. 5 Hz Cut off frequency of high pass filter Fc = 10 Hz Cut off frequency of low pass filter Wn = [1 - exp[(-Fn/f 0)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
Future SMA’s Will Be Powerful The 3 x 3” UCSD/HPWREN Cerf. Cube, the basis of a new strong motion monitoring concept that runs a Linux operating system, consists of a high-performance Intel Strong. ARM 1110 processor with 32 MB RAM and 16 MB Flash.
Structural Monitoring Systems Will Be Powerful
What Instrumentation Do We Need to Enhance/Improve Strong Motion Data? 1. 2. 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?
DIVERSE SENSING FOR STRONG-MOTION Uni-axial Accelerometer Tri-axial Accelerometer Rotation Sensor Pressure Cell and Sensor Displacement Transducer
How Can Seismic Data=Strong Motion Data? o o What can be done to make the lowgain components of seismic network data acceptable to our engineering needs? How can our engineering needs drive the low-gain components of ground motion networks?
Primary Participants or Secondary Data Users? Products: Seismic Monitoring Waveform data & metadata • Engineering products • Emergency response products • Public Products • Other
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 Ph. D’s together to process the data and develop a consensus. Come back in a few days.
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