| Date: | 2011-12-19 17:50:36 | |
| Sender: | ”Erricos C. Pavlis” <epavlis@umbc.edu> | |
| Subject: | [RapidServiceMail] No.17: Re: ILRS/AWG Rapid Service Mail (JCET) 7308 Erratic Behavior 2011/9-now Message No. 0013 | |
| Content: | Yes Toshi, we see a much smaller effect at Simosato. I have not seen a significant amount of LAGEOS tracking from Tanegashima in several weeks, so I have no feeling for what happened there. ecp On Dec 18, 2011, at 10:01 PM, Toshimichi Otsubo wrote: > Erricos and all, > > I forgot to mention that there should be a few cm discontinuity in > Simosato´s station coordinates also. Attached is the GEONET > solution for Koza GPS site close to Simosato. > > No jump has been observed for Tanegashima. > > Best Regards, > Toshi > ----- > Toshimichi Otsubo > Hitotsubashi University > Web http://geo.science.hit-u.ac.jp/ Tel & Fax +81-42-580-8939 > > > > 2011/12/19 Erricos C. Pavlis >> Duh!!! I am still stuck at Concepcion! I assume that the long break was a result of the quake and the associated disruption of operations due to that, however, it would be good to get an email from the stations when they encounter such problems. Concepcion was very responsive immediately after the quake with frequent reports of the situation and the preliminary damage estimates from the crew and the local GNSS networks. >> I will send the email to the AWG for a bias until we have some better estimate of the position. We will start computing a new time series immediately, but as you say, relaxation still goes on and this site will need special treatment for quite a while. Thanks Toshi! >> >> ecp >> >> On Dec 18, 2011, at 6:23 AM, Toshimichi Otsubo wrote: >> >>> Erricos and all (including Kunimori-san in cc:), >>> >>> Hiroo Kunimori´s email address is now kuni@nict.go.jp. >>> The ILRS website etc should indeed be updated. >>> (Kunimori-san, contact Carey on this update asap.) >>> >>> The large scatter is very likely due to the co- and post- >>> seismic deformation due to the 11-March earthquake. >>> See the attached graph provided by the GEONET project, >>> Japanese GPS network. Top: East(up)-West(down), >>> Bottom: North(up)-South(down). >>> >>> This tells the station´s motion is mostly in eastward, and >>> it amounts to > 30 cm although Koganei is 300-400 km >>> away from the epicenter. >>> >>> Note that the post-seismic motion is still ongoing as you >>> see, and therefore it will be hard for the AWG to set >>> the coordinates update timing/frequency, I guess. >>> >>> Best Regards, >>> Toshi >>> ----- >>> Toshimichi Otsubo >>> Hitotsubashi University >>> Web http://geo.science.hit-u.ac.jp/ Tel & Fax +81-42-580-8939 >>> >>> >>> >>> 2011/12/18 Erricos C. Pavlis >>>> >>>> >>>> ******************************************************************************** >>>> ILRS/AWG Rapid Service Mail (JCET) 7308 Erratic Behavior 2011/9-now Message No. 0013 ******************************************************************************** >>>> Dear all, >>>> >>>> An examination of the recent data from Koganei (7308) indicates that after a fairly >>>> long period of unreported down-time (Feb. 22, 2011 to Sept. 2011), the system is now >>>> behaving very differently and exhibits a rather large scatter in its bias which is >>>> very significant in comparison to the associated accuracy estimates (see the attached >>>> plots for the period preceding the current period for LAGEOS and LAGEOS 2 passes from >>>> 2009 to present). >>>> >>>> The sitelog does not refer to any recent work on the system, but it is probably >>>> outdated since the station web page that is listed there is non-existent and the >>>> email for the contact person (Hiroo Kunimori) is also outdated. >>>> >>>> The AWG should immediately proceed with the adjustment of (at least) a bias per weekly >>>> solution to avoid corruption of the ILRS products. >>>> >>>> ecp >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >>>> Dr. Erricos C. Pavlis Phone:+1 (410) 455-5832 >>>> Research Scientist FAX: +1 (410) 455-5868 >>>> US Mobile: +1-240-381-9879 >>>> EU Mobile: +30-694-241-5079 >>>> >>>> Chair, ILRS Analysis Working Group >>>> >>>> Goddard Earth Science and Technology Center, (GEST/UMBC) >>>> University of Maryland, Baltimore County & NASA Goddard >>>> Academic IV Wing A Suite 114E >>>> 1000 Hilltop Circle >>>> Baltimore, Maryland >>>> U S A 21250 epavlis@umbc.edu >>>> >>>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >>>> >>>> >>> >> >> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> Dr. Erricos C. Pavlis Phone:+1 (410) 455-5832 >> Research Scientist FAX: +1 (410) 455-5868 >> US Mobile: +1-240-381-9879 >> EU Mobile: +30-694-241-5079 >> >> Chair, ILRS Analysis Working Group >> >> Goddard Earth Science and Technology Center, (GEST/UMBC) >> University of Maryland, Baltimore County & NASA Goddard >> Academic IV Wing A Suite 114E >> 1000 Hilltop Circle >> Baltimore, Maryland >> U S A 21250 epavlis@umbc.edu >> >> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Dr. Erricos C. Pavlis Phone:+1 (410) 455-5832 Research Scientist FAX: +1 (410) 455-5868 US Mobile: +1-240-381-9879 EU Mobile: +30-694-241-5079 Chair, ILRS Analysis Working Group Goddard Earth Science and Technology Center, (GEST/UMBC) University of Maryland, Baltimore County & NASA Goddard Academic IV Wing A Suite 114E 1000 Hilltop Circle Baltimore, Maryland U S A 21250 epavlis@umbc.edu +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |