LDEO Seismology: Long-Period Noise

KMBO-IU , LH2-10

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

201810 LH2-10 AR 342 -146 -149 -152 -153 -155 -157 -158 -159 -160 -162 -162 -164 -164 -166 -167 -168 -170 -170 -171 -169 -163 -158 -157 -157 -154

201809 LH2-10 AR 719 -145 -147 -150 -152 -155 -156 -158 -159 -161 -162 -164 -165 -166 -167 -169 -170 -171 -172 -171 -169 -163 -159 -158 -156 -153

201808 LH2-10 AR 476 -146 -148 -151 -153 -156 -157 -159 -161 -162 -163 -165 -166 -167 -169 -170 -172 -173 -174 -174 -172 -165 -159 -156 -157 -155

201807 LH2-10 AR 690 -147 -149 -152 -153 -156 -157 -158 -160 -161 -162 -164 -165 -166 -168 -169 -171 -172 -173 -173 -168 -161 -156 -155 -154 -151

201803 LH2-10 AR 21 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999

201802 LH2-10 AR 50 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999

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
201810	LH2-10	AR	342	-146	-149	-152	-153	-155	-157	-158	-159	-160	-162	-162	-164	-164	-166	-167	-168	-170	-170	-171	-169	-163	-158	-157	-157	-154
201809	LH2-10	AR	719	-145	-147	-150	-152	-155	-156	-158	-159	-161	-162	-164	-165	-166	-167	-169	-170	-171	-172	-171	-169	-163	-159	-158	-156	-153
201808	LH2-10	AR	476	-146	-148	-151	-153	-156	-157	-159	-161	-162	-163	-165	-166	-167	-169	-170	-172	-173	-174	-174	-172	-165	-159	-156	-157	-155
201807	LH2-10	AR	690	-147	-149	-152	-153	-156	-157	-158	-160	-161	-162	-164	-165	-166	-168	-169	-171	-172	-173	-173	-168	-161	-156	-155	-154	-151
201803	LH2-10	AR	21	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
201802	LH2-10	AR	50	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