How does this cartoon relate to a lecture on IRIS you may a - PowerPoint Presentation

Slide1

How does this cartoon relate to a lecture on IRIS you may ask? Like IRIS, PhD Comics .com is an essential website for any graduate student. As I said at the beginning, this class is all about imparting practical knowledge. Slide2

Incorporated Research Institutions for Seismology

IRIS

Navigating the Webpage; Data ToolsSlide3

IRIS Mission

Facilitate and conduct geophysical investigations of seismic sources and Earth properties using seismic and other geophysical methods.

Promote exchange of geophysical data and knowledge, through use of standards for network operations, data formats, and exchange protocols, and through pursuing policies of free and unrestricted data access.

Foster cooperation among IRIS members, affiliates, and other organizations in order to advance geophysical research and convey benefits from geophysical progress to all of humanity. Slide4

IRIS Programs

DMS - Data Management System

Includes the Data Management Center (DMC)

PASSCAL - Program for Array Seismic Studies of the Continental Lithosphere

Provides active and passive seismic instrumentation

GSN - Global Seismic Network

USArray

- In partnership with

Earthscope

Education and Outreach

Homepage:

http://

www.iris.eduSlide5

Seismic MonitorSlide6

Data at the DMC

Seismic data at the DMC comes from a variety of sources

IRIS/USGS (GSN data)IRIS/IDA (more GSN data)

PASSCAL Instrument Center (PIC)

Univ. of Washington (provides phase picks)

Array Network Facilities (TA data)

Kyrgyzstan International Research Center

Kazakhstan Seismic Data CenterSlide7

Types of Data 1

Waveform Data

Active Source data – primarily from PASSCAL

Passive Source data – majority of the waveforms at DMC

Channel Response Data

Event or Earthquake Catalogs

NEICALRT

FINGER (last 7 days of data)

QED (quick epicenter determinations)

WHDF (weekly hypocenter data file)

MHDF (monthly hypocenter data file)

ISCCD (two year lag)Slide8

Types of Data 2

Continuous Waveform Data

Event Oriented Data

Assembled DataSlide9

Metadata

Data about data

For seismic data, the metadata is the information aboutNetwork

Station

Channel

ResponseSlide10

Data Formats

SEED –

Standard for the Exchange of Earthquake Data

A SEED volume contains both waveform and metadata

Dataless

SEED volumes include only the metadata

SEED volumes can also store hypocenter and phase data

miniSEED

Dataonly

SEED file

SAC – Seismic Analysis Code

One of the most common formats in use for passive seismic data

SEG-Y

One of the most common formats in use for active source dataSlide11

Where do you begin?

www.iris.edu/dataSlide12
Slide13
Slide14

Continuous Data

BUD – Buffer of Uniform Data

near real-time, not quality controlled (

unQC’d

), partial datasets

Continuous

miniSEED

data organized by channel day

Archived Data

delayed,

QC’d

, full data sets

Customize your request to get full SEED volumesSlide15

Event Oriented Data

SPYDER – System to Provide You Data from Earthquakes Rapidly

Near real-time,

unQC’d

, partial data sets

You will get data from BUD as well as other

autoDRMs

around the world

FARM – Fast Archive Recovery Method

Delayed,

QC’d

, full data set

DMC routinely pre-assembles data for Mw≥5.7 and down to 5.5 if depth is ≥100 km

Pre-assembled datasets are for 60 minutes past origin time and are available 6 weeks to 3 months post-

eqSlide16

Assembled Data

Any non-SEED pre-assembled dataset

Assembled data sets, for the most part, come "as-is." Some sets can be broken up into smaller sets but most come as a complete package.

Most assembled datasets are active source reflection/refraction experiments collected on portable PASSCAL instrumentation

Others are from USGS, SEIS-UK, OBSIP (active or passive source), other academic institutions.

Not necessarily seismic data (gravimeter, etc.)Slide17
Slide18

How do you know what is at the DMC?

SeismiQuery

Set of pre-formatted database queries that access the DMC Oracle databaseSlide19

Wilbur II

Personal favorite, web-based event based request tool

Choose an earthquake, choose a group of stations, set a request based on arrival time, download the seed volume from the web in either SEED or SAC format

http://www.iris.edu/dms/wilber.htm

ftp://ftp.iris.washington.edu/pub/userdata/Heather_DeShon/DeShon_Chile2010/Slide20

A side note on

Virtual Networks

a group of stations and/or seismic networks, representing an affiliation that goes beyond the traditional bounds of seismic networks to represent an umbrella organization or initiative

Common ones to use

_GSN GSN

_US-TA

USArray

Transportable Array

_US-FA

USArray

Flexible Array

_US-BB

USArray

Backbone

_US-ALL

USArray

all components Slide21

BUD web tool

Accesses continuous waveforms

Slide22

BreqFast

Batch

REQuests, FastEmailed to

breq_fast@iris.washington.edu

Submitting

breq_fast

files via a Mac e-mail client.

Under the Mac Mail preferences there is a "Message Format" under the "Composing" tab that should be in "Plain Text" rather than "Rich Text".

Web requests via

SeismiQuery

http://

www.iris.edu/SeismiQuery/breq_fast.phtmlSlide23

EXAMPLE of Email Text Format …fixed format file

.NAME Heather DeShon

.INST Univ. Memphis

.MAIL 3890 Central Ave. Memphis TN 38152

.EMAIL

hdeshon@memphis.edu

.PHONE 901-678-1527

.FAX -

.MEDIA Electronic (ftp)

.LABEL Peru.1991032013.1.request

.QUALITY B

.END

GRFO IU 1999 01 02 00 18 10.4 1999 01 02 00 20 10.4 1 SHZ

ANTO IU 1999 01 02 02 10 36.6 1999 01 02 02 12 36.6 1 SH?

AFI IU 1999 01 02 02 10 37.1 1999 01 02 02 12 37.1 1 BH? 00 Slide24

A side note on

Waveform Quality

The DMC grades waveform quality accordingly

R – real-time data,

unQC’d

, original waveform

Q –

QC’d

D – older data that can’t be judged as R or Q

The DMC has begun implemented a new type of continuous data that is

dynamically

calculated when you make a request

M – merged R and Q data

You can request .Quality B data, or the best available, but be aware not B gets you M since May 2010Slide25

How much data can I request?

DMC will post SEED volumes up to 30 GB, but you have to use 64-bit version 5.0 of

rdseed

to extract the data

This is a new policy. The limit used to be 2GB and smaller shipments can still be read using older 32-bit versions of

rdseedSlide26

What do I do with

a SEED file?

rdseed

or

jrdseed

- reads a seed volume

Comes as a

unix

executable that can be run with flags or in an interactive mode

Comes as a java-based

gui

You can output the waveforms stored in the seed volume into a number of standard formats, including SAC

Usage:

rdseed

-{

acCsSpRtde

} [-

f

filename] [

v

(

n

)]Slide27

JWEED and VASE

JWEED and VASE are Java based applications that you have to install on your computer. They are not currently installed at CERI, except on some faculty Macs

JWEED – Java version of the event-related WEED request tool

VASE – Viewer and Seismogram Extraction tool used to access continuous dataSlide28

DHI Servers

JWEED and VASE access data from any participating Data Handling Interface (DHI) servers.

Current servers for waveforms include

4 IRIS servers (POND, DC, BUD, Archive)

GSC

2 Berkeley servers for

NorCal

data (DART, DC)

2

CalTech

servers for

SoCal

data

IPGP -

Geoscope

Also have event servers, including MemphisSlide29

Move to JWEED tutorialSlide30

SOD

Standing Order for Data

Developed a the Univ. of South

Carolina

http://www.seis.sc.edu/sod/

Automates

data selection, downloading, and routine processing

tasks

Can

also be used to query DHI servers and create

breqfast

requests

When left running, any time an earthquake meeting your criteria occurs, the data will be accessed, processed, and downloaded to your machineSlide31

SOD gets installed on a

unix

system and is run from a terminal command line Usage: sod –

f

sodrecipe

Write

xml formatted input files

called SOD recipes that

specify criteria for data selection and a processing stream (filters, remove instrument response, etc.

)

eventArm

-

eventArm

gathers events from the server specified in the event finder

networkArm

-

The

networkArm

goes out to the server specified in the network finder, and retrieves all the networks, stations sites, and channels that server knows about that pass the

subsetters

contained in the arm

waveformArm

-

waveformArm

downloads and processes waveforms individually

waveformVectorArm

-

The

waveformVectorArm

groups three orthogonal components from a site and then does its processing on them as a group.