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1、IntroductiontoMarineSeismicProcessing-ProMAXAndrewGoodliffeUniversityofAlabamaSocorro,NM,WednesdayMay28ProMAXExerciseWhatisProMAX?AsoftwarepackageforprocessingreflectionseismicdataCommonlyusedintheenergyindustryNotfree!Therearemanyotherprogramsthatwilldothesamesortofthi
2、ng–theydiffermainlyintheiruserinterface(orlackthereof)RunsonmanyflavorsofUNIXWheredidthedatacomefrom?AshortseismicreflectionsurveyinPapuaNewGuineaSeptember1999R/VMauriceEwing1.2kmstreamer48channels25mgroupinterval1395inch3tunedsixairgunarray25mshotinterval24-foldCMPs12.
3、5mapart1Arc-second(~30m)gridsDownloadedfromtheUSGSSeamlessserver(http://seamless.usgs.gov/)andconvertedtoaGMTformat(NetCDF)gridRe-sampled(usinggrdfilter)toa0.0005degreegridAlsoavailablefromNASA(ftp://e0srp01u.ecs.nasa.gov)WoodlarkBasinAriftbasininPapuaNewGuineaAclassicp
4、lacetostudytheorogenicriftingtoseafloorspreadingtransitionThelinethatwewilllookatcrossesalargeriftbasinclosetothetransitiontoseafloorspreadingThesurveywascarriedoutaspartofanOceanDrillingProgramsitesurveyHighPressureAirSources:TheAirGunReadyFire!FiredLowerchamberhasatop
5、diameterthat'ssmallerthebottomdiameter-airpressureforcesthepistondownandsealingtheupper,firingchamber.HighpressureairisfillingthefiringchamberthroughtheT-shapedpassage,andthefiring,oractuatingairpassageisblocked(solidblack)byasolenoidvalve.Fullpressurehasbuiltupintheupp
6、erchamber.TheSolenoidhasbeentriggered,releasinghigh-pressureairintotheactiveairpassage,whichisnowyellow.Theairfillstheareadirectlybelowthepiston,overcomingthesealingeffectoftheairinthelower,controlchamber.Thepistonmovesupwards,releasingtheairintheupperchamberintothewate
7、r.Alargebubbleofcompressedairisexpandingintothesurroundingwater.Theairinthelowercontrolchamberhasbeencompressed.Thetriggeredair,releasedintothespacebelowthepiston,isfullyexpanded,andcannowexhaustatacontrolledratethroughtheventports.Asthistakesplace,thepistonrapidlybutge
8、ntlymovesdownward,re-sealingthechamber,andreadyingthesoundsourceforrefilling.From:http://www.ldeo.columbia.edu
