SHORT EXPLANATION: These seismograms were produced by a broadband seismometer in the Leonard walk-in vault. They show only vertical (ie, not East-West or North-South) ground motion. The seismograms show 24 horizontal lines, one for each hour of ground motion. The data is filtered so that it shows mainly surface waves from distant earthquakes. Some earthquakes are labeled (usually two to four each day) to show the earthquake region, the distance from Leonard in great circle degrees (eg. D=120), and magnitude (eg 5.1mb). Definite earthquake surface waves of earthquakes not located at the time the figure was posted may be marked with a ?. Some of the seismograms with large surface waves which may obscure other smaller earthquakes are SIGNED ROOT COMPRESSED or SIGNED POWER EXPANDED This consists of taking the root (from the 1.1 root to the 3.0 root) of each number while keeping the original sign (plus or minus) of the number.LONG EXPLANATION: hardware and software details. The epicenters used in annotation are from these two sources: 1.Swiss Seismological Service (Red Puma) seismo.ethz.ch/redpuma/redpuma_ami_list.html 2.U.S. Geological Survey, National Earthquake Information Center. neic.usgs.gov/neis/bulletin/ These web pages are processed by a NAWK program which calculates the distance to Leonard, Oklahoma U.S., and the expected arrival times of P/Pdif/PKP and LR. Sources 1. and 3. tend to have lower magnitudes than source 2. Beginning 2001 FEB05 some magnitudes are annotated as "M", because the USGS stopped distinguishing the magnitudes of their locations as Mw, Ms, mb, etc. Dates below are in the form of yyyymmdd. For example, 2000 Oct21 is listed 20001021. The dates are in inverse order. The most recent seismogram is listed at the top. *=annotations updated after first posted. Monthly seismogram statistics 2001 Dec seismograms animated 664KB 20011231 20011230 20011229 20011228 20011227 20011226 20011225* 20011224 20011223* 20011222 20011221* 20011220* 20011219 20011218 20011217 20011216 20011215* 20011214 20011213 20011212 20011211 20011210* 20011209* 20011208* 20011207* 20011206* 20011205 20011204 20011203 20011202* 20011201* 2001 Nov Seismograms animated 672KB 20011130 20011129 20011128 20011127* 20011126* 20011125 20011124 20011123 20011122* 20011121 20011120 20011119 20011118 20011117* 20011116 20011115 20011114 20011113 20011112 20011111 20011110 20011109 20011108 20011107 20011106 20011105 20011104 20011103 20011102 20011101 2001 Oct Seismograms animated 652KB 20011031 20011030 20011029 20011028 20011027 note re explosions 20011026 HARDWARE CRASH. DATA OUTAGE 20011025. 20011024 20011023* 20011022 20011021 20011020 20011019 20011018 20011017 20011016 20011015 20011014 20011013 20011012 20011011 20011010 20011009 20011008 20011007 20011006 20011005 20011004 20011003 20011002 20011001 2001 Sep Seismograms animated 648KB* 20010930 20010929 20010928 20010927 20010926 20010925* 20010924 20010923* 20010922* 20010921 20010920 20010919 20010918 20010917 20010916* 20010915 20010914 20010913 20010912* 20010911 20010910* 20010909 20010908 20010907 20010906 20010905 20010904 20010903* 20010902 20010901 2001 Aug Seismograms animated 663KB* 20010831 20010830 20010829 20010828 20010827 20010826 20010825 20010824* 20010823 20010822 20010821 20010820 20010819* 20010818 20010817 20010816 20010815 20010814* 20010813 20010812* 20010811 20010810* 20010809* 20010808 20010807 20010806 20010805* 20010804* 20010803 20010802* 20010801* 2001 Jul Seismograms animated 660KB* 20010731 20010730 20010729* 20010728 20010727 20010726 20010725 20010724 20010723 20010722* 20010721 20010720 20010719 20010718 20010717 20010716 20010715 20010714 20010713 20010712 20010711* 20010710 20010709 20010708 20010707 20010706 20010705* 20010704 20010703 20010702 20010701 2001 Jun Seismograms animated 650KB* 20010630* 20010629 20010628 20010627 20010626 20010625 20010624 20010623* PERU 8.1MW 20010622 20010621 20010620 20010619 20010618 20010617 20010616 20010615 20010614 20010613 20010612 20010611 20010610 20010609 20010608 20010607* 20010606* 20010605 20010604 20010603 20010602* 20010601 2001 May Seismograms animated 648KB 20010531 20010530 20010529* 20010528 20010527 20010526 20010525 20010524 20010523 20010522 20010521 20010520 20010519 20010518 20010517 20010516 20010515 20010514 20010513 20010512 20010511 20010510 20010509 20010508 20010507 20010506 20010505 20010504 Arkansas 4.4mblg 20010503 20010502 20010501 2001 April Seismograms animated 440KB 20010430 20010429 20010428 20010427 20010426 20010425 20010424 20010423 20010422 20010421 20010420 20010419 20010418 20010417 20010416 20010415 20010414 20010413 20010412 20010411 20010410 20010409 20010408 20010407 20010406 Filter change 20010406 20010405 20010405 20010404 20010403 20010402 20010401 2001 March Seismograms animated 677KB 20010331 20010330 20010329 20010328 20010327 20010326 20010325* 20010324 20010323 20010322* 20010321 20010320 20010319 20010318 20010317 20010316 20010315 20010314 20010313 20010312* 20010311* 20010310* 20010309* 20010308 20010307 20010306 20010305 20010304* 20010303 20010302 20010301 20010228 Washington (state) 6.9Ms 20010227 20010226 20010225 20010224 20010223 20010222 Oklahoma 2.4M 20010222 Oklahoma at high frequencies 20010221 20010220 20010219 20010218 20010217 20010216 20010215 20010214 20010213 El Salvador 6.6M, Sumatera 7.3M 20010212 20010211 20010210 20010209 20010208 20010207 20010206 20010205 20010204 20010203 20010202 20010201 20010131 20010130 20010129 20010128 20010127 20010126 Southern India 8.2Ms 20010125 20010124 20010123 20010122 20010121 20010120 20010119 20010118 20010117 20010116 20010115 20010114 20010113 El Salvador 7.6Mw 20010112 20010111 20010110 20010109 20010108 20010107 20010106 20010105 20010104 20010103 20010102 20010101
Seismogram Index For Year 2000
