LDEO Seismology: Long-Period Noise

BFO-II , LHN-50

Noise Levels at Different Periods

The table below gives the decibel 10% noise level (in db) for each month in several period bands. The 10% noise level is defined as the signal level not exceeded 10% of the time, based on hourly measurements. Each entry in the table is color coded with reference to the New Low Noise Model (NLNM, Peterson, 1993):
navy, -6 db < value-NLNM < -3 db
blue, -3 db < value-NLNM < 3 db
aqua, 3 db < value-NLNM < 6 db
lime, 6 db < value-NLNM < 9 db
yellow, 9 db < value-NLNM < 12 db
orange, 12 db < value-NLNM < 15 db
red, 15 db < value-NLNM < 20 db
fuchsia, 20 db < value-NLNM < 25 db
silver, value-NLNM < -6 db, value-NLNM > 25 db

Black indicates that there was an insufficient number of hourly measurements to calculate a noise level.

Noise levels (PSD) in decibels
Month Chan. Qual. # obs. 518s 439s 373s 316s 268s 228s 193s 164s 139s 118s 100s 85s 72s 61s 52s 44s 37s 32s 27s 23s 19s 16s 14s 12s 10s

201904 LHN-50 AR 47 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999

201903 LHN-50 AR 737 -162 -163 -164 -164 -165 -165 -165 -166 -167 -169 -171 -173 -175 -177 -178 -179 -179 -178 -176 -173 -166 -159 -151 -150 -150

201902 LHN-50 AR 669 -163 -164 -164 -165 -165 -165 -165 -166 -167 -169 -171 -173 -175 -177 -178 -179 -179 -178 -176 -173 -166 -159 -153 -150 -150

201901 LHN-50 AR 732 -163 -164 -165 -165 -165 -166 -167 -168 -169 -171 -172 -174 -176 -178 -178 -179 -178 -177 -176 -173 -166 -159 -153 -151 -151

201812 LHN-50 AR 743 -163 -164 -165 -165 -166 -166 -167 -168 -169 -171 -172 -174 -176 -178 -179 -179 -179 -178 -176 -173 -166 -160 -154 -152 -152

201811 LHN-50 AR 703 -164 -164 -165 -165 -165 -165 -166 -168 -170 -171 -173 -175 -177 -178 -179 -180 -179 -178 -176 -173 -165 -158 -153 -151 -152

201810 LHN-50 AR 32 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999

Month	Chan.	Qual.	# obs.	518s	439s	373s	316s	268s	228s	193s	164s	139s	118s	100s	85s	72s	61s	52s	44s	37s	32s	27s	23s	19s	16s	14s	12s	10s
201904	LHN-50	AR	47	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999
201903	LHN-50	AR	737	-162	-163	-164	-164	-165	-165	-165	-166	-167	-169	-171	-173	-175	-177	-178	-179	-179	-178	-176	-173	-166	-159	-151	-150	-150
201902	LHN-50	AR	669	-163	-164	-164	-165	-165	-165	-165	-166	-167	-169	-171	-173	-175	-177	-178	-179	-179	-178	-176	-173	-166	-159	-153	-150	-150
201901	LHN-50	AR	732	-163	-164	-165	-165	-165	-166	-167	-168	-169	-171	-172	-174	-176	-178	-178	-179	-178	-177	-176	-173	-166	-159	-153	-151	-151
201812	LHN-50	AR	743	-163	-164	-165	-165	-166	-166	-167	-168	-169	-171	-172	-174	-176	-178	-179	-179	-179	-178	-176	-173	-166	-160	-154	-152	-152
201811	LHN-50	AR	703	-164	-164	-165	-165	-165	-165	-166	-168	-170	-171	-173	-175	-177	-178	-179	-180	-179	-178	-176	-173	-165	-158	-153	-151	-152
201810	LHN-50	AR	32	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999