Download considerations for future seismic systems - cosmos

CONSIDERATIONS FOR
FUTURE SEISMIC SYSTEMS
Bob Nigbor
USC
No Technological Barriers Exist to RealTime, Automated Data Processing
SSN Strong-Motion Network and
Seismic Information System (NSN/SIS)
System drawing: Overview
PLMN
GSM/GPRS TIM
Glossary
SGSN
SGSN Serving GPRS Support Node
TIM
GGSN Gateway GPRS Support Node
GGSN
Backbone IP
TIM
CDN “Ci
“Circuito
i Diretto
Di
Numerico”
N
i ”
Digital Direct Connection
Mail
M
il
Server
CDN
Border
gateway
GPRS Router
Device Server
SSN LAN
ETNA
CH 1-3
AUXILIARY
RS-232C
EXT. POWER
Central
Processing
System
@ SSN
10 X 3-channel strongmotion remote station
(SMRS)
via GPRS
This drawing contains proprietary information and should not be copied or distributed without prior written permission from Kinemetrics, Inc.
Immediate Parametric Information
Will Be the Expectation
E
Example:
l
JMA Intensity
I t
it Calc
C l in
i SMA Firmware
Fi
The JMA Intensity Calculation uses a special FIR filter the matches
the passband of the SHINDOF instrument exactly.
K = 1.75
Slope
l
off top off filter
fl
f0 = 0.5 Hz
Cut off frequency of high pass filter
Fc = 10 Hz
Cut off frequency of low pass filter
Wn = [1 - exp[(
exp[(-Fn/f0)3]]1/2
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
Fi
Figure
1 IJMA Bandpass
B d
FIR Filt
Filter E
Equation
ti
The JMA Intensity is calculated from the KAWASUMI equation
IJMA = 2 * log(acceleration) + 0.7
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
g
1110 p
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 Wh
1.
Whatt improvements
i
t in
i SMA’s
SMA’ are
needed to eliminate “corrections” and
allow automated processing?
2 Wh
2.
What (non-acceleration)
(
l
i ) 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?
† Wh
Whatt can be
b done
d
to
t make
k the
th lowl
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?
Primary Participants or Secondary
Data Users?
Products:
Seismic
Monitoring
g
Waveform
data &
metadata
•Engineering
products
•Emergency
response
products
•Public Products
•Other
Oth
A Star Trek Future?
Captain
C
t i Ki
Kirk:
k C
Computer,
t
what are the parameters of
that earthquake on the
p
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.