Amplitude Check

Investigate daily average (noise) amplitudes at a given frequency for every data channel. The daily average is corrected (levelled) by the median of average values of all stations. These levelled daily average values stay normally within a certain range. Unusual deviations of this value detected in a long term statistics indicate problems with data or metadata. The following table shows automatically detected deviations for three channels (ZNE or Z12), if existing, in color codes: green - OK, yellow - the last day shows unusual deviation, orange - the last week shows unusual deviation, red - the last month shows unusual deviation, gray or white - no (recent) data. The station set is separated in broadband stations (VBB) and short period (SP) stations, investigated at different frequencies. VBB stations show low scatter in the noise data at 0.15 Hz since the signal is dominated by the ocean microseism. For SP stations this frequency is out of scale. Therefore a higher frequency is chosen where the scatter is much larger and the resolution for detecting errors is reduced.

The figures below the table show the individual measurements on the channels. Description see there.

This page is daily updated.

last 365 days, created 22-Sep-2023

VBB Stations @ 0.15Hz
GR.AHRW GR.ASSE GR.BFO GR.BRG
GR.BSEG GR.BUG GR.CLL GR.CLZ
GR.FBRG GR.FUR GR.GEC2 GR.GEC7
GR.GOLD GR.GOR1 GR.GRA1 GR.GRA2
GR.GRA3 GR.GRA4 GR.GRB1 GR.GRB2
GR.GRB3 GR.GRB4 GR.GRB5 GR.GRC1
GR.GRC2 GR.GRC3 GR.GRC4 GR.GTTG
GR.HAM4 GR.HLGA1 GR.HLGA2 GR.HLGA3
GR.HLGB1 GR.HLGB2 GR.IGAD GR.KAST
GR.KBON GR.KHUS GR.KUDEN GR.LNIZ
GR.LUEB GR.MILB GR.MOX GR.RETH
GR.RETHO GR.SCHI GR.SKMB GR.TNS
GR.UBBA GR.UBR GR.WET GR.ZARR
HS.RIED HS.WBA KQ.BIRK KQ.MRLW
KQ.NONN KQ.PEEM SX.BURZL SX.FROHN
SX.NEUB SX.TANN SX.WIMM TH.ABG1
TH.ANNA TH.BBWF TH.BONN TH.CHRS
TH.CRUX TH.FRAU TH.GEIDO TH.GERA
TH.GLEI TH.GRZ1 TH.HKWD TH.HWTS
TH.KAMM TH.LEIB1 TH.MEHR TH.MLFH
TH.MODW TH.MORAS TH.MOXB TH.NEUST
TH.PLN TH.POSS TH.RANIS TH.SONN
TH.SPAHL TH.THWA TH.TIER TH.VITZ
TH.WARTH TH.ZEITZ TH.ZEU

SP Stations @ 1.00Hz
GR.A807 GR.DEEL GR.FAHL GR.GEA0
GR.GEA1 GR.GEA2 GR.GEA3 GR.GEB1
GR.GEB2 GR.GEB3 GR.GEB4 GR.GEB5
GR.GEC1 GR.GEC3 GR.GEC4 GR.GEC5
GR.GEC6 GR.GED1 GR.GED2 GR.GED3
GR.GED4 GR.GED5 GR.GED6 GR.GED7
GR.GED8 GR.GED9 GR.GOR2 GR.GOR3
GR.GOR5 GR.GOR6 GR.HALO GR.INS3
GR.INS4B GR.INS5 GR.INS6B GR.INS7
GR.INS8 GR.INSH GR.RAST GR.SEVE
GR.SYKE GR.TMO20 GR.TMO22 GR.TMO54
GR.TMO55 GR.TMO57 GR.TMO66 GR.UNDO
GR.ZURM HS.EBSD HS.GODD HS.GWBC
HS.GWBD HS.GWBE HS.GWBF HS.GWBO
HS.WBB HS.WBBU HS.WBED HS.WBFO
HS.WBG HS.WBNH HS.WBRD RN.BAVN
RN.BKLB RN.BTEZ RN.BULI RN.HMES
RN.IBBE RN.IBBS RN.ZER1 RN.ZERL
SX.FBE SX.GUNZ SX.LEUT SX.MULD
SX.ROHR SX.SCHF SX.TRIB SX.WERD
SX.WERN

Colors: no data amplitude ok last day over thresh last week over thresh last month over thresh


The figures below show the levelled average of the last 365 days (x-axis: 0 = one year ago, 364 = yesterday) in color codes, scaled by the individual standard deviation of the measurement series. Bold colors in red and blue indicate large deviations from the average to high or low values, respectively. Gray or pastel shaded colors represent the normal scatter. White means no data computed. The numbers after 'm:' and 's:' in the figure titles are the relative mean and the standard deviation in log10(nm/s), respectively. Please note that the mean and standard deviation is computed after removing the upper and lower 15% of the data to remove the influence of outliers. Maximum color boldness is reached at 10 standard deviations (red for positive, blue for negative amplitudes). The color intensity for log amplitudes below 5.5 standard deviations is reduced by a square function. Similar color patterns at neighbored stations indicate natural undulations in the noise signal.

Color coded deviations VBB

relative amplitudes VBB


Color coded deviations SP

relative amplitudes SP