Recent Enhancements and Research Highlights at the NEES@UCSB Permanently

Instrumented Field Sites

Jamison H. Steidl

Multi-Disciplinary Earthquake Engineering Field Site for Earthquake Monitoring and Active Experiments

Steidl – Earth Science, Engineering Seismology Youd – Geotechnical Engineering, Liquefaction Nigbor – Structural Engineering

Constructed 2002-2004Operations 2004-2014

What is NEES@UCSB ?

Earthquake monitoring: Densely instrumented field sites that continuously record observations of:

Ground accelerations at the surface and at multiple depths within the soil column and rock below

Pore pressure within the soil column Foundation and structural response of a

simple reconfigurable steel-framed structure

What is NEES@UCSB ?

What is NEES@UCSB?

These field sites provide the insitu case histories for validation and calibration of our end-to-end (rupture to rafters)simulation codes Predicting ground motions that include the effects

of the near surface geotechnical layers, and Soil-Foundation-Structure Interaction (SFSI) effects.

Active Source Testing: We don’t just sit and wait for earthquakes to happen!

Densely instrumented field sites that provide observations from active sources:

T-Rex and Liquidator (NEES@Utexas) Large Shakers (NEES@UCLA) Permanent shaker mounted to SFSI structure Permanent Borehole Sources (new FY2010)

What is NEES@UCSB ?

Facility Enhancements

Web-based data dissemination tools Waveform Explorer Addition of International Geotechnical Array Data

Tele-Operational SFSI shaker Permanent Cross-Hole Array Shape Accelerometer Arrays

Research Highlights

NEESR UCB Grand Challenge Project NEES@UCLA working at WLA (2010) and GVDA (2011)

NEESR CMU Research Testing with T-Rex at GVDA and WLA in 2010 and 2012

NEESR RPI Research Testing with T-Rex at WLA in 2010 and 2012

Poster Session at Quake Summit 2012

EOT Highlights

Animations of the SFSI and Mini-Me structures using earthquake data See poster

Animations of Site Response at GVDA using earthquake data See poster

Use of the permanent tele-operational SFSI shaker at GVDA for classroom instruction

Network adoption of the MYOE activity

http://nees.ucsb.edu

http://nees.ucsb.edu/facilities

http://nees.ucsb.edu/data

http://nees.ucsb.edu/data

http://nees.ucsb.edu/data

http://dl.dropbox.com/u/49050676/Data%20Portal%20Tutorial.mov

Data Portal Screen Cast Tutorial

http://nees.ucsb.edu/data

http://nees.ucsb.edu/data

The Event Search

The Event Search

From 10/1/2004 to 6/30/2012 4660 M1+ events available at GVDA 6608 M1+ events available at WLA

We use a radius that increases as magnitude increases, so small events only from very close to site. Progressively larger events from progressively farther away.

Select Your Event

Choose Waveforms to View

Click the view button and launch waveform explorer tool

dbwfserver

NEES / EarthScope Collaboration

Thanks to EarthScope Array Network Facility

Rob Newman

Juan Reyes

Kent Lindquist

Frank Vernon

Waveform Viewer

Waveform Viewer User Config

Waveform Viewer Zoom & Scroll

Download Data

Download Data

Concurrent Development at NEEShub

Future Work

Matlab reader automatically added to download package for miniseed binary files

Expand: Include vertical array data from other national and international providers

Permanent Cross-Hole ArrayDaily Up/Down Hammer tests

Permanent Cross-Hole ArrayDaily Up/Down Hammer tests

Permanent Cross-Hole ArrayDaily Up/Down Hammer tests

Permanent Cross-Hole ArrayDaily Up/Down Hammer tests

Shear wave velocity appears to have a seasonal dependence on water

table depth

Permanent Cross-Hole ArrayDaily Up/Down Hammer tests

Automatic Triggering of Cross-Hole source after threshold ground motion level Starts 3 minutes after threshold Hammer source then triggers every 5 minutes Slowly gets back to once per day

The ability to examine shear-wave velocity decrease and recovery following large earthquake with permanent cross-hole array is a one-of-a-kind unique capability

Please visit us at . . .

http://nees.ucsb.edu/

Special Thanks to the nees@UCSB Team:

Sandy SealePaul HegartyFrancesco CivliliniRobin Gee

Special Thanks to our Sponsor NSF

The George E. Brown, Jr. Network for Earthquake Engineering Simulation (NEES) Program of the National Science Foundation

Award Numbers CMS-0217421, CMS-04002490, and CMMI-0927178

Thank You!