NGA Subduction Ground Motions: Database & Ground Motions...GASubduction ons [email protected] COSMOS technical session, 16 November 2018 NGA Subduction Ground Motions: Database & Ground

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s

[email protected] COSMOS technical session, 16 November 2018

NGA Subduction Ground Motions: Database & Ground Motions

COSMOS Technical Session, 16 November 2018

University of California, BerkeleyUniversity of California, Los AngelesRisk Management Solutions, Inc.University of California, Santa BarbaraUnited States Geological SurveyCoreLogic, Inc., Oakland

California Department of TransportationPacific Engineering and AnalysisBechtel CorporationBen-Gurion University of the Negev, IsraelNational Taiwan University, TaiwanSinotech Engineering Consultants, Taiwan

FM GlobalTokyo Institute TechnologyAMEC E&IUniversity of California, DavisWalling Consulting, Alameda Western University, Canada

Yousef BozorgniaTadahiro KishidaNorman A. AbrahamsonSean K. AhdiTimothy D. AnchetaRalph J. ArchuletaGail AtkinsonDavid M. BooreKenneth W. CampbellBrian ChiouVictor Contreras

Robert DarraghNick GregorI.M. IdrissChen JiRonnie KamaiNicolas KuehnDong Youp KwakAnnie KwokPo-Shen LinHarold MagistraleSilvia Mazzoni

Sifat MuinSaburoh MidorikawaGrace ParkerHongjun SiWalter J. SilvaJonathan P. StewartMelanie WallingKatie E. WooddellRobert R. Youngs

Graduate StudentsPost-Doctoral ResearchersResearchers

ProfessorsConsultantsEngineering Professionals

SeismologistsGeologistsGeotechnical EngineersStructural Engineers

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Objective of Ground-Motion Database

• A large multidisciplinary community-based research initiative to develop a comprehensive ground-motion database and multiple ground-motion models (GMMs) for subduction events• Assemble dataset of ground-motion records that are

uniformly processed and formatted• Assemble ground-motion database

• Record metadata (source, site, path, recording)• Intensity Measures

• Develop ground-motion models to estimate Intensity Measures for engineering applications• Spectral Acceleration• Duration• Directivity & Directionality• Spectral Damping

• Provide access to the records for engineering applications

2

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Components of Ground-Motion DatabaseInstrument Recordings:

• Processing, Filtering, formatting• Acceleration, Velocity, Displacement Time Series• Duration Characteristics• Response Spectra• Fourier Amplitude Spectra

Record Metadata Database:• Site & Source Metadata

• Site Class and profile @ recording station• Earthquake Magnitude and mechanism

• Path Metrics: Distance Metrics• Time-Series Recording Metadata

Public-Access• Record Flatfile• Selected Subset of time-series files

3

Relational Database

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Why a relational database?

And not just a flatfile?

• Data in the database is grouped in data-tables connected by keys

• No duplicate data• More efficient to update

• Less likely to introduce errors

• Expandable

• Can communicate with other databases

• Easy to query and store

• The flatfile is a product of the database

4

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Products

• 5 Ground-Motion Models• Abrahamson-Gulerce

• Kuehn-Bozorgnia-Campbell-Gregor

• Parker-Stewart-Boore-Atkinson

• Youngs-Chiou-Alatik

• Si-Kishida-Midorikawa

• Spectral-Damping-Model Development by Rezaeian

• Ground-Motion Database• Metadata

• Intensity Measures

• Flatfile for GMM development

• Time-Series Records of Instrument Recordings

5

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


NGAsub Database Data

• Engineering application in the Pacific North-West (PNW)

• Total: 71,343 records (26,456 pga >= 0.01g)

• Database Sources:•Japan 40717 records (15456 pga >= 0.01g)

•Taiwan 12506 records (5002 pga >= 0.01g)

•Cascadia (PNW) 2140 records (196 pga >= 0.01g)

•Alaska 3029 records (115 pga >= 0.01g)

•Central America & Mexico 2648 records (1245 pga >= 0.01g)

•South America 5994 records (2425 pga >= 0.01g)

•New Zealand 4309 records (2017 pga >= 0.01g)

6

NGA-West2

had 21,540

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Regions

7

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


What is New in Subduction Earthquakes

• Larger Magnitudes

attenuates farther

• Longer durations

• Different effects of Damping

• Two types of events:• Interface (larger magnitude)

• Intraslab (closer distances)

• Backarc/Forearc effects

• Different Geographic regions• Non-ergodic models

• Vertical Component

8

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Spectral Amplitude

9

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Spectra Amplitude, Regions

10

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Backarc/Forearc – Americas & New Zealand

11

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Magnitude & Distance

12

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


PGA vs Distance

13

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Public Release of Ground-Motion Records

• The real value in the database is the metadata

• QA of the metadata requires many iterations and eyes

• Cannot release records without metadata

• Objectives of QA:• With such a large dataset collected from various sources

throughout we will have both errors and inconsistencies

• The objective was to minimize errors and inconsistencies, maintaining repeatability of the data

• Current ACTION: Release ~500 records

• 2018 COSMOS TS attendees are beta-testers of this dataset. Please provide feedback.

14

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Magnitude & Distance

15

x Preliminary Public Release of 500 NGAsub Records

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


PGA vs Distance

16

x Preliminary Public Release of 500 NGAsub Records

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Response Spectra

17

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

1.E+01

0.01 0.1 1 10

PSA

(g)

Period (sec)

Interface Events

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

1.E+01

0.01 0.1 1 10

PSA

(g)

Period (sec)

Intraslab Events

1.E-05

1.E-04

1.E-03

1.E-02

1.E-01

1.E+00

1.E+01

0.01 0.1 1 10

PSA

(g)

Period (sec)

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Stats

18

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Stats – Interface/Intraslab

19

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Stats

20

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Stats – Interface/Intraslab

21

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


NGAsub Products & Timelines

• Preliminary set of 500 records – today

• Ground-Motion Database Report – December 2018

• Ground-Motion Models – February

• Damping Model – March/April

22

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


To download Preliminary Set:

• It is noted that we make no recommendation to end-users in using these preliminary records for consulting, engineering, design, evaluation, construction, research, and/or any other applications. The NGA-Subduction Research Group, its individual researchers and practitioners, sponsors, and University of California, do not assume any responsibility about the accuracy and applicability of the released ground motions for any project(s). It is the full responsibility of the end users to verify the accuracy and applicability of such ground motions.

• You, the COSMOS TS attendees are beta testers for the ground-motion set. Your feedback is imperative to improve the quality of the products we release!!

23

NG

ASu

bd

uct

ion

Gro

un

d M

oti

on

s


Submit Form

• https://rebrand.ly/NGAsub_PreliminaryGMsuite_PublicRelease

• Product: Zip file containing• Excel file with record metadata and

spectra (partial flatfile)

• 1,500 .AT2 files, 3 directions per acceleration record

24

Documents

NGA Subduction Ground Motions: Database & Ground Motions...GASubduction ons [email protected] COSMOS technical session, 16 November 2018 NGA Subduction Ground Motions: Database & Ground