LDEO Seismology: Long-Period Noise

MCWV-US , LHE

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. 268s 228s 193s 164s 139s 118s 100s 85s 72s 61s 52s 44s 37s 32s 27s 23s 19s 16s 14s 12s 10s

201105 LHE AR 46 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999

201104 LHE AR 720 -126 -128 -130 -131 -133 -135 -136 -138 -139 -141 -142 -143 -144 -146 -148 -150 -151 -152 -152 -151 -149

201103 LHE AR 744 -128 -129 -130 -131 -133 -134 -136 -137 -139 -140 -141 -143 -144 -146 -147 -149 -150 -150 -150 -149 -147

201102 LHE AR 672 -131 -132 -135 -136 -138 -139 -141 -142 -143 -145 -146 -147 -148 -150 -152 -152 -152 -150 -149 -149 -148

201101 LHE AR 744 -132 -133 -135 -136 -138 -138 -140 -142 -143 -144 -145 -147 -149 -150 -151 -152 -151 -149 -148 -147 -146

201012 LHE AR 744 -127 -129 -130 -131 -133 -133 -135 -137 -138 -139 -140 -141 -143 -144 -146 -147 -148 -148 -146 -146 -148

201011 LHE AR 719 -129 -132 -134 -136 -137 -139 -140 -142 -144 -145 -146 -147 -148 -149 -151 -152 -151 -150 -147 -146 -146

201010 LHE AR 742 -131 -132 -133 -135 -136 -137 -139 -140 -143 -144 -145 -147 -148 -150 -151 -153 -154 -152 -151 -149 -148

201009 LHE AR 720 -131 -132 -133 -135 -136 -137 -139 -140 -141 -143 -144 -145 -147 -149 -151 -152 -152 -153 -153 -152 -151

201008 LHE AR 724 -131 -133 -134 -136 -137 -138 -140 -142 -143 -145 -146 -148 -150 -151 -153 -154 -155 -155 -157 -156 -154

201007 LHE AR 79 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999

200811 LHE AR 442 -147 -148 -149 -150 -151 -152 -153 -154 -155 -156 -157 -158 -159 -161 -161 -161 -159 -156 -153 -150 -148

200810 LHE AR 674 -145 -147 -148 -149 -150 -151 -152 -153 -154 -155 -157 -158 -160 -161 -162 -162 -160 -155 -152 -150 -150

200809 LHE AR 680 -143 -144 -145 -146 -147 -148 -149 -150 -151 -152 -153 -154 -155 -156 -157 -158 -158 -155 -154 -152 -150

200808 LHE AR 93 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999

Month	Chan.	Qual.	# obs.	268s	228s	193s	164s	139s	118s	100s	85s	72s	61s	52s	44s	37s	32s	27s	23s	19s	16s	14s	12s	10s
201105	LHE	AR	46	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999
201104	LHE	AR	720	-126	-128	-130	-131	-133	-135	-136	-138	-139	-141	-142	-143	-144	-146	-148	-150	-151	-152	-152	-151	-149
201103	LHE	AR	744	-128	-129	-130	-131	-133	-134	-136	-137	-139	-140	-141	-143	-144	-146	-147	-149	-150	-150	-150	-149	-147
201102	LHE	AR	672	-131	-132	-135	-136	-138	-139	-141	-142	-143	-145	-146	-147	-148	-150	-152	-152	-152	-150	-149	-149	-148
201101	LHE	AR	744	-132	-133	-135	-136	-138	-138	-140	-142	-143	-144	-145	-147	-149	-150	-151	-152	-151	-149	-148	-147	-146
201012	LHE	AR	744	-127	-129	-130	-131	-133	-133	-135	-137	-138	-139	-140	-141	-143	-144	-146	-147	-148	-148	-146	-146	-148
201011	LHE	AR	719	-129	-132	-134	-136	-137	-139	-140	-142	-144	-145	-146	-147	-148	-149	-151	-152	-151	-150	-147	-146	-146
201010	LHE	AR	742	-131	-132	-133	-135	-136	-137	-139	-140	-143	-144	-145	-147	-148	-150	-151	-153	-154	-152	-151	-149	-148
201009	LHE	AR	720	-131	-132	-133	-135	-136	-137	-139	-140	-141	-143	-144	-145	-147	-149	-151	-152	-152	-153	-153	-152	-151
201008	LHE	AR	724	-131	-133	-134	-136	-137	-138	-140	-142	-143	-145	-146	-148	-150	-151	-153	-154	-155	-155	-157	-156	-154
201007	LHE	AR	79	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999
200811	LHE	AR	442	-147	-148	-149	-150	-151	-152	-153	-154	-155	-156	-157	-158	-159	-161	-161	-161	-159	-156	-153	-150	-148
200810	LHE	AR	674	-145	-147	-148	-149	-150	-151	-152	-153	-154	-155	-157	-158	-160	-161	-162	-162	-160	-155	-152	-150	-150
200809	LHE	AR	680	-143	-144	-145	-146	-147	-148	-149	-150	-151	-152	-153	-154	-155	-156	-157	-158	-158	-155	-154	-152	-150
200808	LHE	AR	93	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999	999