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 23-Feb-2024

VBB Stations @ 0.15Hz
BQ.BGG BQ.BNS BQ.DREG BQ.HILG
BQ.HOBG BQ.KOE BQ.NAST GR.AHRW
GR.ASSE GR.BFO GR.BRG GR.BSEG
GR.BUG GR.CLL GR.CLZ GR.FBRG
GR.FSWO 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.MILB 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 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.NEUB SX.TANN SX.WIMM TH.ABG1
TH.ANNA TH.BARBA TH.BONN TH.CRUX
TH.FRAU TH.GEIDO TH.GERA TH.GLEI
TH.GRZ1 TH.HKWD 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
BQ.BA02 BQ.JUE BQ.KLL BQ.LAUG
BQ.RODG GR.A807 GR.DEEL GR.FAHL
GR.FSHA GR.FSMA GR.FSRU 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.INS8
GR.INSH GR.RAST GR.SEVE GR.SYKE
GR.TMO22 GR.TMO54 GR.TMO55 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.BODE LE.BRET LE.DUP LE.FELD
LE.IMS LE.KOGO LE.LDE LE.LDO
LE.MOER LE.MSS LE.NICK LE.OPP
LE.RIVT LE.ROTE LE.ROTT LE.TETT
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