Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 31-12-2020 and time 01:41:52 (Italy) in region 3 km W Montemonaco (AP)

A magnitude ML 1.7 earthquake occured in region: 3 km W Montemonaco (AP), on

  • 31-12-2020 00:41:52 (UTC)
  • 31-12-2020 01:41:52 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8940, 13.2980 at 25 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
Montemonaco AP 3 604 604
Montegallo AP 6 523 1127
Montefortino FM 7 1178 2305
Amandola FM 11 3629 5934
Castelsantangelo sul Nera MC 12 281 6215
Comunanza AP 12 3166 9381
Bolognola MC 13 142 9523
Palmiano AP 13 196 9719
Arquata del Tronto AP 13 1178 10897
Ussita MC 14 444 11341
Roccafluvione AP 15 2010 13351
Sarnano MC 16 3264 16615
Venarotta AP 16 2066 18681
Acquasanta Terme AP 17 2916 21597
Montefalcone Appennino FM 17 424 22021
Smerillo FM 17 365 22386
Visso MC 18 1107 23493
Force AP 18 1354 24847
Acquacanina MC 18 121 24968
Monte San Martino MC 19 765 25733
Fiastra MC 20 559 26292
Gualdo MC 20 815 27107

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km NW of Teramo (54892 inhabitants)
49 Km E of Foligno (57155 inhabitants)
61 Km N of L'Aquila (69753 inhabitants)
65 Km NE of Terni (111501 inhabitants)
78 Km E of Perugia (166134 inhabitants)
81 Km NW of Montesilvano (53738 inhabitants)
83 Km S of Ancona (100861 inhabitants)
89 Km NW of Pescara (121014 inhabitants)
93 Km NW of Chieti (51815 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 1.7 2020-12-31
00:41:52		 42.8935 13.2983 25 2021-02-26
14:56:17		 Bollettino Sismico Italiano INGV 86850601
Reviewed
Rev100 		ML 1.7 2020-12-31
00:41:52		 42.8923 13.2958 24 2020-12-31
00:47:06		 Sala Sismica INGV-Roma 85891701
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-31 00:41:52 ± 0.11
Latitude 42.8935 ± 0.0036
Longitude 13.2983 ± 0.0049
Depth (km) 25 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 86850601

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 458
Semi-minor axis of confidence ellipse (meter) 80
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 69
Circular confidence region, given by single value of horizontal uncertainty (meter) 460.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 58
Number of associated phases, regardless of their use for origin computation 46
Number of defining phases 46
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.02158
Epicentral distance of station farthest from the epicenter (degree) 0.54139
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 24
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 22
Type of magnitude ML
Reference to an origin 86850601
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-02-25 13:26:20

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 22
Type of magnitude ML
Reference to an origin 85891701
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-31 00:47:06
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2020-12-31T00:42:10.77 0.6 undecidable manual S 288 54.501 108 0.78 37
IV.EL6.EHZ. 2020-12-31T00:42:09.48 0.6 undecidable manual S 342 50.9157 109 0.4 43
IV.GAVE.EHZ. 2020-12-31T00:42:07.04 0.6 undecidable manual S 236 39.7269 115 0.72 39
IV.CAMP.HHE. 2020-12-31T00:42:06.56 0.6 undecidable manual S 167 40.7259 114 0.01 47
IV.TERO.HHZ. 2020-12-31T00:42:06.27 0.3 undecidable manual S 140 39.0276 116 0.13 70
IV.MNTT.EHZ. 2020-12-31T00:42:05.17 0.6 undecidable manual S 52 30.5472 123 1.01 35
IV.CESI.HHZ. 2020-12-31T00:42:05.39 0.6 undecidable manual S 291 34.2435 119 0.37 44
IV.MNTP.HNZ. 2020-12-31T00:42:04.55 0.3 undecidable manual S 27 30.4473 123 0.42 66
IV.T1299.HNN. 2020-12-31T00:42:04.23 0.6 undecidable manual S 183 28.749 124 0.46 44
IV.SMA1.EHZ. 2020-12-31T00:42:03.83 0.3 undecidable manual S 174 29.3484 124 -0.06 71
IV.MOMA.HHZ. 2020-12-31T00:42:03.66 0.3 undecidable manual P 261 60.0954 106 0.27 65
IV.SAP2.EHZ. 2020-12-31T00:42:03.13 0.6 undecidable manual S 20 23.9538 130 0.38 45
IV.PF6.EHN. 2020-12-31T00:42:03.32 0.3 undecidable manual S 343 28.3494 125 -0.36 68
IT.MTCL.HGZ. 2020-12-31T00:42:03.26 0.6 undecidable manual S 295 26.751 127 -0.06 48
IV.FEMA.HNE. 2020-12-31T00:42:02.50 0.6 undecidable manual S 291 21.5673 134 0.23 47
IV.FDMO.HHZ. 2020-12-31T00:42:02.30 0.3 undecidable manual S 313 23.3544 131 -0.32 69
IV.CSP1.EHZ. 2020-12-31T00:42:02.39 0.3 undecidable manual S 341 23.2545 131 -0.22 70
IV.ASSB.HHZ. 2020-12-31T00:42:02.45 0.3 undecidable manual P 288 54.501 108 -0.12 68
IV.NRCA.HHZ. 2020-12-31T00:42:01.36 0.3 undecidable manual S 246 16.3725 142 0.02 74
IV.MTRA.HNZ. 2020-12-31T00:42:01.29 0.3 undecidable manual S 152 17.1717 141 -0.18 71
IV.GUMA.HHZ. 2020-12-31T00:42:01.83 0.3 undecidable manual S 9 18.9699 138 0.04 74
IV.MF5.EHZ. 2020-12-31T00:42:01.55 0.3 undecidable manual S 51 16.7721 142 0.14 72
IV.EL6.EHZ. 2020-12-31T00:42:01.86 0.3 undecidable manual P 342 50.9157 109 -0.18 68
IV.OFFI.HHE. 2020-12-31T00:42:00.44 0.3 undecidable manual P 82 31.8459 121 1.07 51
IV.GAVE.EHZ. 2020-12-31T00:42:00.61 0.1 undecidable manual P 236 39.7269 115 0.16 92
IV.CAMP.HHE. 2020-12-31T00:42:00.35 0.3 undecidable manual P 167 40.7259 114 -0.23 68
IV.MC2.EHZ. 2020-12-31T00:42:00.61 0.3 undecidable manual S 283 9.0798 157 0.25 72
IV.TERO.HHZ. 2020-12-31T00:42:00.13 0.3 undecidable manual P 140 39.0276 116 -0.21 68
IV.MMO1.EHZ. 2020-12-31T00:41:59.55 0.3 undecidable manual S 74 2.3976 174 -0.36 70
IV.MNTT.EHZ. 2020-12-31T00:41:59.34 0.1 undecidable manual P 52 30.5472 123 0.14 94
IV.CESI.HHZ. 2020-12-31T00:41:59.64 0.3 undecidable manual P 291 34.2435 119 -0.05 71
IV.T1299.HNN. 2020-12-31T00:41:59.12 0.3 undecidable manual P 183 28.749 124 0.14 71
IT.MTCL.HGZ. 2020-12-31T00:41:58.63 0.3 undecidable manual P 295 26.751 127 -0.09 72
IV.CSP1.EHZ. 2020-12-31T00:41:58.09 0.1 negative manual P 341 23.2545 131 -0.21 94
IV.MNTP.HNZ. 2020-12-31T00:41:58.99 0.1 undecidable manual P 27 30.4473 123 -0.19 93
IV.SMA1.EHZ. 2020-12-31T00:41:58.90 0.1 undecidable manual P 174 29.3484 124 -0.14 94
IV.FEMA.HNE. 2020-12-31T00:41:58.00 0.3 undecidable manual P 291 21.5673 134 -0.11 72
IV.SAP2.EHZ. 2020-12-31T00:41:58.30 0.3 undecidable manual P 20 23.9538 130 -0.09 72
IV.PF6.EHN. 2020-12-31T00:41:58.56 0.3 undecidable manual P 343 28.3494 125 -0.37 68
IV.FDMO.HHZ. 2020-12-31T00:41:58.04 0.1 positive manual P 313 23.3544 131 -0.27 93
IV.NRCA.HHZ. 2020-12-31T00:41:57.50 0.1 positive manual P 246 16.3725 142 -0.07 98
IV.MC2.EHZ. 2020-12-31T00:41:57.03 0.1 undecidable manual P 283 9.0798 157 0.03 100
IV.GUMA.HHZ. 2020-12-31T00:41:57.67 0.1 undecidable manual P 9 18.9699 138 -0.16 96
IV.MTRA.HNZ. 2020-12-31T00:41:57.44 0.1 undecidable manual P 152 17.1717 141 -0.21 95
IV.MF5.EHZ. 2020-12-31T00:41:57.54 0.1 undecidable manual P 51 16.7721 142 -0.07 98
IV.MMO1.EHZ. 2020-12-31T00:41:56.46 0.1 undecidable manual P 74 2.3976 174 -0.28 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.EHE. ML:1.8 0.0003445 0.18 AML other m 2020-12-31T00:42:01.49
IV.NRCA.HHN. ML:2.2 0.0008105 1.02 AML other m 2020-12-31T00:42:01.75
IV.MTRA.EHN. ML:1.9 0.0003715 0.52 AML other m 2020-12-31T00:42:01.64
IV.GUMA.HHE. ML:1.8 0.00032799999999999995 1.58 AML other m 2020-12-31T00:42:01.95
IV.NRCA.HNN. ML:2.2 0.000805 1.04 AML other m 2020-12-31T00:42:02.70
IV.NRCA.HHE. ML:2.1 0.0006895 0.72 AML other m 2020-12-31T00:42:02.66
IV.NRCA.HNE. ML:2.1 0.0006134999999999999 0.74 AML other m 2020-12-31T00:42:02.67
IV.FDMO.HHE. ML:1.5 0.0001385 0.18 AML other m 2020-12-31T00:42:02.46
IV.CSP1.EHE. ML:2.2 0.0006644999999999999 0.48 AML other m 2020-12-31T00:42:02.64
IV.GUMA.HHN. ML:1.7 0.0002485 0.34 AML other m 2020-12-31T00:42:02.48
IV.FDMO.HHN. ML:1.7 0.000225 0.2 AML other m 2020-12-31T00:42:02.75
IV.CSP1.EHN. ML:2.0 0.0005329999999999999 0.36 AML other m 2020-12-31T00:42:02.73
IV.SMA1.EHE. ML:1.5 0.0001305 0.44 AML other m 2020-12-31T00:42:04.34
IV.SMA1.EHN. ML:1.4 0.00009889999999999999 0.78 AML other m 2020-12-31T00:42:05.33
IV.CESI.HHE. ML:1.5 0.00010475000000000001 0.46 AML other m 2020-12-31T00:42:05.51
IV.CESI.HHN. ML:1.6 0.000122 0.22 AML other m 2020-12-31T00:42:05.75
IV.TERO.HHE. ML:1.2 0.000049850000000000006 0.88 AML other m 2020-12-31T00:42:06.51
IV.TERO.HHN. ML:1.3 0.00006584999999999999 0.06 AML other m 2020-12-31T00:42:07.17
IV.GAVE.EHE. ML:1.7 0.00013335 0.18 AML other m 2020-12-31T00:42:08.57
IV.GAVE.EHN. ML:1.5 0.00009165 0.74 AML other m 2020-12-31T00:42:09.64
IV.MOMA.HHN. ML:1.6 0.000077 0.42 AML other m 2020-12-31T00:42:15.51
IV.MOMA.HHE. ML:1.5 0.000061 0.8 AML other m 2020-12-31T00:42:16.47
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download