Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 31-10-2016 and time 22:31:48 (Italy) in region 9 km E Norcia (PG)

A magnitude ML 2.0 earthquake occured in region: 9 km E Norcia (PG), on

  • 31-10-2016 21:31:48 (UTC)
  • 31-10-2016 22:31:48 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8070, 13.1990 at 9 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Norcia PG 9 4957 4957
Arquata del Tronto AP 9 1178 6135
Castelsantangelo sul Nera MC 11 281 6416
Montegallo AP 12 523 6939
Accumoli RI 13 667 7606
Montemonaco AP 15 604 8210
Preci PG 15 724 8934
Ussita MC 16 444 9378
Visso MC 17 1107 10485
Acquasanta Terme AP 18 2916 13401
Cascia PG 18 3217 16618
Montefortino FM 19 1178 17796

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km E of Foligno (57155 inhabitants)
45 Km W of Teramo (54892 inhabitants)
53 Km NE of Terni (111501 inhabitants)
53 Km NW of L'Aquila (69753 inhabitants)
74 Km E of Perugia (166134 inhabitants)
84 Km W of Montesilvano (53738 inhabitants)
91 Km W of Pescara (121014 inhabitants)
94 Km S of Ancona (100861 inhabitants)
94 Km NW of Chieti (51815 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
99 Km NE of Tivoli (56533 inhabitants)
99 Km E of Viterbo (67173 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 2.0 2016-10-31
21:31:48		 42.8072 13.1988 9 2019-02-12
14:03:38		 Bollettino Sismico Italiano INGV 54104931
Reviewed
Rev100 		ML 2.2 2016-10-31
21:31:48		 42.8032 13.205 10 2016-10-31
21:48:46		 Sala Sismica INGV-Roma 31335001
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2016-10-31 21:31:48 ± 0.05
Latitude 42.8072 ± 0.0036
Longitude 13.1988 ± 0.0037
Depth (km) 9 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 54104931

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 425
Semi-minor axis of confidence ellipse (meter) 170
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 200
Circular confidence region, given by single value of horizontal uncertainty (meter) 420.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 122
Number of associated phases, regardless of their use for origin computation 33
Number of defining phases 33
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.05036
Epicentral distance of station farthest from the epicenter (degree) 0.55668
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 27
Type of magnitude ML
Reference to an origin 54104931
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-02-23 07:50:34

ML:2.2

Field Value
Value 2.2
Uncertainty 0.4
Num. used stations 13
Type of magnitude ML
Reference to an origin 31335001
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2016-10-31 21:48:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SNTG.HHZ. 2016-10-31T21:32:06.45 0.3 undecidable manual S 337 53.9016 50 0.38 66
IV.ASSB.HHZ. 2016-10-31T21:32:05.55 0.6 undecidable manual S 301 51.0156 50 0.23 45
IV.TERO.HHZ. 2016-10-31T21:32:01.71 0.6 undecidable manual S 122 38.8278 50 -0.34 45
IV.GUMA.HHZ. 2016-10-31T21:32:00.10 0.6 undecidable manual S 21 30.4473 50 0.29 46
IV.ATCC.EHZ. 2016-10-31T21:31:59.47 0.3 undecidable manual P 313 61.7937 50 -0.54 62
IV.EL6.EHZ. 2016-10-31T21:31:59.44 0.3 undecidable manual P 352 58.497 50 -0.06 70
IV.T1221.HNE. 2016-10-31T21:31:59.32 0.6 undecidable manual S 282 29.2485 50 -0.17 48
IV.ASSB.HHZ. 2016-10-31T21:31:58.19 0.6 undecidable manual P 301 51.0156 50 -0.17 46
IV.T1215.EHZ. 2016-10-31T21:31:58.63 0.6 undecidable manual S 269 26.8509 109 -0.1 49
IV.SNTG.HHZ. 2016-10-31T21:31:58.58 0.6 undecidable manual P 337 53.9016 50 -0.22 45
IV.T1243.HNZ. 2016-10-31T21:31:57.36 0.6 undecidable manual S 121 23.754 112 -0.35 46
IV.OFFI.HHZ. 2016-10-31T21:31:57.61 0.1 undecidable manual P 70 42.0246 50 0.64 82
XO.AM05.EHZ. 2016-10-31T21:31:57.19 0.6 undecidable manual S 33 22.6551 113 -0.17 48
IV.T1241.HNN. 2016-10-31T21:31:56.18 0.6 undecidable manual S 74 19.6692 116 -0.23 48
IV.TERO.HHZ. 2016-10-31T21:31:56.18 0.1 negative manual P 122 38.8278 50 -0.29 92
IV.T1204.EHZ. 2016-10-31T21:31:56.00 0.6 undecidable manual S 147 17.4714 118 0.28 48
IV.GUMA.HHZ. 2016-10-31T21:31:55.29 0.1 positive manual P 21 30.4473 50 0.11 96
IV.T1216.EHZ. 2016-10-31T21:31:55.66 0.6 undecidable manual S 302 17.2716 118 -0.03 50
IV.MMO1.EHZ. 2016-10-31T21:31:54.57 0.6 undecidable manual S 45 14.5743 123 -0.3 48
IV.T1221.HNE. 2016-10-31T21:31:54.89 0.1 undecidable manual P 282 29.2485 50 -0.1 97
IV.T1215.EHZ. 2016-10-31T21:31:54.50 0.3 undecidable manual P 269 26.8509 109 -0.06 74
IV.T1204.EHZ. 2016-10-31T21:31:53.06 0.3 undecidable manual P 147 17.4714 118 0.24 72
XO.AM05.EHZ. 2016-10-31T21:31:53.76 0.3 undecidable manual P 33 22.6551 113 -0.01 75
IV.T1244.EHZ. 2016-10-31T21:31:53.87 0.6 undecidable manual S 125 9.7791 134 0.31 48
IV.T1241.HNN. 2016-10-31T21:31:53.13 0.1 undecidable manual P 74 19.6692 116 -0.09 99
IV.T1243.HNZ. 2016-10-31T21:31:53.74 0.1 undecidable manual P 121 23.754 112 -0.22 95
IV.MMO1.EHZ. 2016-10-31T21:31:52.26 0.1 undecidable manual P 45 14.5743 123 -0.07 100
IV.NRCA.HHZ. 2016-10-31T21:31:52.94 0.3 undecidable manual S 293 7.4814 141 -0.08 76
IV.T1216.EHZ. 2016-10-31T21:31:52.85 0.3 undecidable manual P 302 17.2716 118 0.05 75
IV.T1245.HNZ. 2016-10-31T21:31:52.46 0.6 undecidable manual S 351 5.5944 149 -0.17 50
IV.T1245.HNZ. 2016-10-31T21:31:51.19 0.1 negative manual P 351 5.5944 149 0.15 100
IV.T1244.EHZ. 2016-10-31T21:31:51.90 0.1 undecidable manual P 125 9.7791 134 0.33 96
IV.NRCA.HHZ. 2016-10-31T21:31:51.48 0.1 undecidable manual P 293 7.4814 141 0.22 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.T1245.HHE. ML:2.5 0.0050562079999999995 0.256 AML other m 2016-10-31T21:31:53.60
IV.T1245.HHN. ML:2.6 0.0066293255 0.1664 AML other m 2016-10-31T21:31:53.46
IV.T1245.HNE. ML:2.5 0.0052340925 0.1664 AML other m 2016-10-31T21:31:53.61
IV.T1245.HNN. ML:2.5 0.006044606500000001 0.1664 AML other m 2016-10-31T21:31:53.46
IV.T1216.EHN. ML:2.1 0.00109155975 0.1664 AML other m 2016-10-31T21:31:55.81
IV.T1204.EHE. ML:2.0 0.0009873865 0.32 AML other m 2016-10-31T21:31:56.33
XO.AM05.EHN. ML:1.1 0.00009002526999999998 0.0896 AML other m 2016-10-31T21:31:57.86
XO.AM05.HNE. ML:1.5 0.0002258034 0.1024 AML other m 2016-10-31T21:31:58.39
IV.GUMA.HNN. ML:2.2 0.00077918575 0.2176 AML other m 2016-10-31T21:32:00.52
IV.TERO.HNE. ML:1.6 0.000150134925 0.1408 AML other m 2016-10-31T21:32:02.62
IV.TERO.HHN. ML:2.0 0.00037529509999999997 0.0896 AML other m 2016-10-31T21:32:02.07
IV.TERO.HNN. ML:2.0 0.00032296150000000004 0.0896 AML other m 2016-10-31T21:32:02.02
IV.TERO.HHE. ML:1.7 0.0001706086 0.1536 AML other m 2016-10-31T21:32:02.55
IV.OFFI.HHE. ML:1.8 0.000207105 0.5632 AML other m 2016-10-31T21:32:09.98
IV.OFFI.HHN. ML:1.9 0.00026716805 0.2432 AML other m 2016-10-31T21:32:05.57
IV.EL6.EHE. ML:2.4 0.0005920908499999999 0.1792 AML other m 2016-10-31T21:32:15.64
IV.EL6.EHN. ML:2.4 0.0006237587 0.2432 AML other m 2016-10-31T21:32:15.85
IV.ATCC.EHE. ML:1.9 0.0001714103 0.128 AML other m 2016-10-31T21:32:17.61
IV.ATCC.EHN. ML:1.8 0.000137579545 0.32 AML other m 2016-10-31T21:32:17.22
IV.ARVD.HHN. ML:1.8 0.00008228237499999999 0.192 AML other m 2016-10-31T21:32:22.44
IV.ARVD.HHE. ML:1.8 0.000094661015 0.1152 AML other m 2016-10-31T21:32:21.56
IV.T0110.HHN. ML:1.7 0.00007326182 0.3968 AML other m 2016-10-31T21:32:29.22
IV.T0110.HHE. ML:1.9 0.00010350046 0.6144 AML other m 2016-10-31T21:32:27.98
IV.MPAG.EHE. ML:1.9 0.00008428271 0.2176 AML other m 2016-10-31T21:32:27.21
IV.MPAG.EHN. ML:1.6 0.0000472986365 0.2688 AML other m 2016-10-31T21:32:27.62
IV.FSSB.HHE. ML:2.3 0.00016911435 0.2944 AML other m 2016-10-31T21:32:29.36
IV.FSSB.HHN. ML:2.4 0.00023887435000000001 0.32 AML other m 2016-10-31T21:32:30.61
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
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