LDEO Seismology: Long-Period Noise

TEIG-IU , LH2-60

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 LH2-60 AR 375 -140 -141 -141 -142 -142 -143 -143 -143 -143 -144 -144 -145 -145 -146 -147 -147 -148 -149 -150 -152 -152 -153 -154 -155 -152

201809 LH2-60 AR 562 -142 -142 -142 -143 -143 -143 -143 -143 -144 -144 -145 -145 -145 -146 -147 -147 -148 -149 -150 -151 -153 -153 -155 -156 -153

201808 LH2-60 AR 305 -141 -142 -142 -143 -143 -143 -143 -144 -144 -144 -144 -144 -145 -146 -146 -147 -148 -148 -150 -151 -152 -153 -155 -157 -156

201807 LH2-60 AR 690 -142 -142 -142 -142 -143 -143 -143 -143 -144 -144 -144 -145 -145 -145 -146 -147 -148 -149 -150 -151 -152 -153 -155 -157 -154

201803 LH2-60 AR 256 -142 -142 -143 -143 -143 -143 -143 -143 -143 -144 -144 -144 -145 -146 -146 -147 -148 -149 -150 -151 -151 -151 -150 -154 -154

201802 LH2-60 AR 64 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999 999

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	LH2-60	AR	375	-140	-141	-141	-142	-142	-143	-143	-143	-143	-144	-144	-145	-145	-146	-147	-147	-148	-149	-150	-152	-152	-153	-154	-155	-152
201809	LH2-60	AR	562	-142	-142	-142	-143	-143	-143	-143	-143	-144	-144	-145	-145	-145	-146	-147	-147	-148	-149	-150	-151	-153	-153	-155	-156	-153
201808	LH2-60	AR	305	-141	-142	-142	-143	-143	-143	-143	-144	-144	-144	-144	-144	-145	-146	-146	-147	-148	-148	-150	-151	-152	-153	-155	-157	-156
201807	LH2-60	AR	690	-142	-142	-142	-142	-143	-143	-143	-143	-144	-144	-144	-145	-145	-145	-146	-147	-148	-149	-150	-151	-152	-153	-155	-157	-154
201803	LH2-60	AR	256	-142	-142	-143	-143	-143	-143	-143	-143	-143	-144	-144	-144	-145	-146	-146	-147	-148	-149	-150	-151	-151	-151	-150	-154	-154
201802	LH2-60	AR	64	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