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 30-Apr-2025

VBB Stations @ 0.15Hz
BQ.BGG BQ.BNS BQ.DREG BQ.HILG
BQ.HOBG BQ.KLL BQ.KOE BQ.NAST
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.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.MILB2 GR.MOX GR.RETHO GR.SKMB
GR.TNS GR.UBBA GR.UBR GR.WET
GR.ZARR HS.WBA KQ.BIRK KQ.BUESM
KQ.LID KQ.MRLW KQ.NONN KQ.PEEM
LE.BABA LE.BUCH LE.DEGG LE.ENDD
LE.FACH LE.FBB LE.FREU LE.GALG
LE.GLOK LE.GUT LE.KIZ LE.LAGB
LE.OMED LE.PEB LE.SIND SX.BURZL
SX.FROHN SX.LANDS SX.NEUB SX.TANN
SX.WIMM TH.ABG1 TH.ANNA TH.BARBA
TH.BBWF TH.BONN TH.CHRS TH.CRUX
TH.FRAU TH.GEIDO TH.GERA TH.GLEI
TH.GRZ1 TH.HKWD TH.KAMM TH.LEIB1
TH.MEHR TH.MLFH TH.MOB10 TH.MOB2
TH.MOB7 TH.MOB9 TH.MODW TH.MORAS
TH.NEUST TH.PLN TH.POSS TH.RANIS
TH.SCHUL TH.SONN TH.SPAHL TH.THWA
TH.TIER TH.VITZ TH.WARTH TH.ZEITZ
TH.ZEU

SP Stations @ 1.00Hz
BQ.BA02 BQ.JUE BQ.KLL BQ.LAUG
BQ.RODG GR.A807 GR.DEEL GR.FAHL
GR.FSKTD 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.RAST GR.SEVE GR.SYKE
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
LE.BIW LE.BRET LE.DUP LE.FELD
LE.IMS LE.IRRE LE.KOGO LE.LDE
LE.LDO LE.MOER LE.MSS LE.NICK
LE.OPP LE.RHEN LE.RIVT LE.ROTE
LE.ROTT LE.TETT LE.TRIT LE.VOGT
LE.WOER RN.BAVN RN.BKLB RN.BTEZ
RN.BULI RN.HMES RN.IBBE RN.ZER1
RN.ZERL 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