Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.1 on date 20-12-2017 and time 23:20:26 (Italy) in region 9 km W Arquata del Tronto (AP)

A magnitude ML 2.1 earthquake occured in region: 9 km W Arquata del Tronto (AP), on

  • 20-12-2017 22:20:26 (UTC)
  • 20-12-2017 23:20:26 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8110, 13.2030 at 11 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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
Arquata del Tronto AP 9 1178 1178
Norcia PG 9 4957 6135
Castelsantangelo sul Nera MC 10 281 6416
Montegallo AP 11 523 6939
Accumoli RI 13 667 7606
Montemonaco AP 14 604 8210
Preci PG 15 724 8934
Ussita MC 16 444 9378
Visso MC 16 1107 10485
Acquasanta Terme AP 18 2916 13401
Cascia PG 19 3217 16618
Montefortino FM 19 1178 17796

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km E of Foligno (57155 inhabitants)
44 Km W of Teramo (54892 inhabitants)
53 Km NE of Terni (111501 inhabitants)
54 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)
93 Km S of Ancona (100861 inhabitants)
94 Km NW of Chieti (51815 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
100 Km NE of Tivoli (56533 inhabitants)
100 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
Reviewed
Rev100 		ML 2.1 2017-12-20
22:20:26		 42.8108 13.2033 11 2017-12-20
22:29:31		 Sala Sismica INGV-Roma 52705801
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2017-12-20 22:20:26 ± 0.06
Latitude 42.8108 ± 0.0018
Longitude 13.2033 ± 0.0049
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 52705801

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 357
Semi-minor axis of confidence ellipse (meter) 174
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 86
Circular confidence region, given by single value of horizontal uncertainty (meter) 360.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 76
Number of associated phases, regardless of their use for origin computation 54
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.19
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.34894
Number of stations at which the event was observed 38
Number of stations from which data was used for origin computation 13
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.2
Num. used stations 60
Type of magnitude ML
Reference to an origin 52705801
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2017-12-20 22:29:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.MODR.HHZ. 2017-12-20T22:21:18.93 3.0 undecidable manual Sn 1.49 0
IV.LAV9.HHZ. 2017-12-20T22:21:04.55 3.0 undecidable manual S 0.49 0
IV.T0110.HHZ. 2017-12-20T22:20:51.67 3.0 undecidable manual S 0.02 0
IV.FAGN.HHZ. 2017-12-20T22:20:46.50 3.0 undecidable manual S -1.66 0
IV.EL6.EHZ. 2017-12-20T22:20:45.00 3.0 undecidable manual S -0.15 0
IV.FIAM.HHZ. 2017-12-20T22:20:45.13 3.0 undecidable manual S -0.79 0
IV.MGAB.HHZ. 2017-12-20T22:20:44.10 3.0 undecidable manual P 2.28 0
IV.CESX.HHZ. 2017-12-20T22:20:44.57 3.0 undecidable manual S 0.36 0
IV.PIEI.HHZ. 2017-12-20T22:20:42.17 3.0 positive manual P -0.71 0
IV.CERT.HHZ. 2017-12-20T22:20:42.43 3.0 positive manual P -0.51 0
IV.MTCE.HHZ. 2017-12-20T22:20:42.24 3.0 undecidable manual P -0.44 0
IV.ATVO.HHZ. 2017-12-20T22:20:41.91 3.0 negative manual P -0.08 0
IV.SRES.HHZ. 2017-12-20T22:20:41.34 3.0 positive manual P 0.22 0
IV.ARVD.HHZ. 2017-12-20T22:20:40.31 3.0 undecidable manual P 0.19 0
IV.T0110.HHZ. 2017-12-20T22:20:39.78 3.0 positive manual P -0.52 0
IV.SSFR.HHZ. 2017-12-20T22:20:39.99 3.0 undecidable manual P 0.18 0
IV.MURB.HHZ. 2017-12-20T22:20:39.25 3.0 positive manual P -0.08 0
IV.VCEL.EHZ. 2017-12-20T22:20:38.51 3.0 undecidable manual P -0.13 0
IV.FAGN.HHZ. 2017-12-20T22:20:38.19 3.0 positive manual P -0.15 0
IV.ATCC.EHZ. 2017-12-20T22:20:37.12 3.0 undecidable manual P -0.11 0
IV.GUMA.HHZ. 2017-12-20T22:20:37.26 0.1 undecidable manual S 21 29.9478 50 0.59 87
IV.FOSV.EHZ. 2017-12-20T22:20:37.56 3.0 positive manual P -0.14 0
IV.CESI.HHZ. 2017-12-20T22:20:37.37 0.1 undecidable manual S 312 32.4453 50 0.03 98
IV.RM33.EHZ. 2017-12-20T22:20:37.78 0.1 undecidable manual S 178 33.5442 50 0.16 95
IV.CING.HHZ. 2017-12-20T22:20:37.20 3.0 positive manual P -0.21 0
IV.CAMP.HHZ. 2017-12-20T22:20:37.85 0.1 undecidable manual S 151 34.8429 50 -0.12 94
OB.GAVE.EHZ. 2017-12-20T22:20:36.45 0.1 undecidable manual S 243 28.4493 50 0.19 95
IV.CESX.HHZ. 2017-12-20T22:20:36.17 3.0 negative manual P 0.05 0
IV.EL6.EHZ. 2017-12-20T22:20:36.59 3.0 undecidable manual P -0.06 0
IV.LNSS.HHZ. 2017-12-20T22:20:36.02 0.1 undecidable manual S 210 26.6511 50 0.23 94
IV.FIAM.HHZ. 2017-12-20T22:20:36.91 3.0 negative manual P -0.17 0
IV.CSP1.EHZ. 2017-12-20T22:20:36.94 0.1 undecidable manual S 0 31.1466 50 -0.06 96
IV.MOMA.HHZ. 2017-12-20T22:20:35.60 3.0 negative manual P 0.05 0
IV.ASSB.HHZ. 2017-12-20T22:20:35.27 3.0 negative manual P -0.22 0
IV.SNTG.HHZ. 2017-12-20T22:20:35.79 3.0 negative manual P -0.12 0
IV.FDMO.HHZ. 2017-12-20T22:20:35.62 0.1 undecidable manual S 339 26.751 50 -0.2 94
IV.SMA1.EHZ. 2017-12-20T22:20:34.68 0.1 undecidable manual S 152 22.755 50 -0.06 97
IV.ARRO.EHZ. 2017-12-20T22:20:34.30 3.0 positive manual P -0.02 0
IV.T1299.EHZ. 2017-12-20T22:20:34.41 0.1 undecidable manual S 162 20.6682 50 0.22 96
IV.OFFI.HHZ. 2017-12-20T22:20:34.79 3.0 positive manual P 0.73 0
IV.TERO.HHZ. 2017-12-20T22:20:33.38 0.1 undecidable manual P 122 38.7279 50 -0.22 92
IV.RM33.EHZ. 2017-12-20T22:20:32.69 0.1 positive manual P 178 33.5442 50 -0.11 96
IV.CAMP.HHZ. 2017-12-20T22:20:32.83 0.1 negative manual P 151 34.8429 50 -0.17 94
IV.CSP1.EHZ. 2017-12-20T22:20:32.32 0.1 positive manual P 0 31.1466 50 -0.11 96
IV.GUMA.HHZ. 2017-12-20T22:20:32.45 0.1 positive manual P 21 29.9478 50 0.21 94
IV.T1221.EHZ. 2017-12-20T22:20:32.10 0.1 negative manual P 281 29.5482 50 -0.08 97
IV.CESI.HHZ. 2017-12-20T22:20:32.50 0.1 undecidable manual P 312 32.4453 50 -0.13 96
IV.MMO1.EHZ. 2017-12-20T22:20:32.35 0.1 undecidable manual S 46 14.0748 128 -0.02 100
IV.FDMO.HHZ. 2017-12-20T22:20:31.56 0.1 negative manual P 339 26.751 50 -0.19 95
IV.SMA1.EHZ. 2017-12-20T22:20:31.07 0.1 undecidable manual P 152 22.755 50 -0.06 98
OB.GAVE.EHZ. 2017-12-20T22:20:31.98 0.1 positive manual P 243 28.4493 50 -0.03 98
IV.LNSS.HHZ. 2017-12-20T22:20:31.69 0.1 undecidable manual P 210 26.6511 50 -0.05 98
IV.T1299.EHZ. 2017-12-20T22:20:30.96 0.1 positive manual P 162 20.6682 50 0.15 97
IV.MMO1.EHZ. 2017-12-20T22:20:29.84 0.1 undecidable manual P 46 14.0748 128 0.08 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.T1299.HNE. ML:1.9 0.000618 0.14 AML other m 2017-12-20T22:20:34.60
IV.T1299.EHE. ML:1.9 0.0005865 0.14 AML other m 2017-12-20T22:20:34.61
IV.SMA1.EHE. ML:2.2 0.001127 0.22 AML other m 2017-12-20T22:20:34.90
IV.T1299.HNN. ML:2.0 0.0006594999999999999 0.8 AML other m 2017-12-20T22:20:34.51
IV.T1299.EHN. ML:2.0 0.00065 0.28 AML other m 2017-12-20T22:20:35.38
IV.FDMO.HHN. ML:2.5 0.00185 0.24 AML other m 2017-12-20T22:20:35.85
IV.FDMO.HHE. ML:2.4 0.0012900000000000001 0.22 AML other m 2017-12-20T22:20:35.85
IV.SMA1.EHN. ML:2.1 0.0008269999999999999 1.7 AML other m 2017-12-20T22:20:35.99
IV.LNSS.HHE. ML:2.4 0.001276 0.12 AML other m 2017-12-20T22:20:36.52
IV.T1221.EHN. ML:2.0 0.000455 0.26 AML other m 2017-12-20T22:20:36.88
IV.LNSS.HHN. ML:2.4 0.00131 0.44 AML other m 2017-12-20T22:20:36.62
IV.CSP1.EHN. ML:1.8 0.000292 0.3 AML other m 2017-12-20T22:20:37.14
IV.CESI.HHE. ML:2.1 0.000621 0.38 AML other m 2017-12-20T22:20:37.75
IV.CESI.HHN. ML:2.2 0.000787 0.12 AML other m 2017-12-20T22:20:37.76
IV.CAMP.HHE. ML:2.3 0.0007765 0.28 AML other m 2017-12-20T22:20:38.20
IV.CSP1.EHE. ML:2.1 0.000646 0.86 AML other m 2017-12-20T22:20:38.51
IV.CAMP.HHN. ML:1.9 0.000317 0.66 AML other m 2017-12-20T22:20:38.11
IV.T1221.EHE. ML:1.9 0.0003695 0.46 AML other m 2017-12-20T22:20:38.40
IV.RM33.HNN. ML:2.4 0.0010375 0.88 AML other m 2017-12-20T22:20:38.30
IV.RM33.EHN. ML:2.4 0.001008 0.9 AML other m 2017-12-20T22:20:38.30
IV.RM33.HNE. ML:2.4 0.0011400000000000002 0.14 AML other m 2017-12-20T22:20:38.85
IV.RM33.EHE. ML:2.4 0.001135 0.28 AML other m 2017-12-20T22:20:38.85
IV.TERO.HHE. ML:2.1 0.000486 0.5 AML other m 2017-12-20T22:20:39.52
IV.TERO.HHN. ML:2.1 0.000434 0.48 AML other m 2017-12-20T22:20:40.95
IV.ASSB.HHE. ML:2.0 0.00023199999999999997 0.68 AML other m 2017-12-20T22:20:43.49
IV.MOMA.HHN. ML:2.2 0.00044750000000000004 1 AML other m 2017-12-20T22:20:43.28
IV.SNTG.HHN. ML:1.8 0.000158 0.26 AML other m 2017-12-20T22:20:43.90
IV.SNTG.HHE. ML:1.8 0.0001395 1.36 AML other m 2017-12-20T22:20:43.90
IV.MOMA.HNN. ML:2.3 0.0004935 1 AML other m 2017-12-20T22:20:44.57
IV.MOMA.HHE. ML:2.4 0.000617 0.26 AML other m 2017-12-20T22:20:44.20
IV.ASSB.HHN. ML:2.0 0.00028100000000000005 0.32 AML other m 2017-12-20T22:20:44.68
IV.MOMA.HNE. ML:2.3 0.00058 0.26 AML other m 2017-12-20T22:20:45.30
IV.CESX.HHN. ML:2.0 0.000262 0.22 AML other m 2017-12-20T22:20:45.56
IV.FIAM.HHE. ML:2.0 0.0001885 1.02 AML other m 2017-12-20T22:20:46.27
IV.CESX.HHE. ML:2.1 0.000287 0.54 AML other m 2017-12-20T22:20:46.43
IV.FOSV.EHN. ML:1.9 0.0001575 1.54 AML other m 2017-12-20T22:20:46.89
IV.CING.HHN. ML:2.0 0.00020400000000000003 0.1 AML other m 2017-12-20T22:20:47.21
IV.EL6.EHE. ML:2.2 0.00033899999999999995 0.2 AML other m 2017-12-20T22:20:47.56
IV.EL6.EHN. ML:2.3 0.00040649999999999996 0.42 AML other m 2017-12-20T22:20:47.68
IV.CING.HHE. ML:2.0 0.00017749999999999998 1.46 AML other m 2017-12-20T22:20:47.00
IV.FIAM.HHN. ML:1.9 0.00014299999999999998 0.36 AML other m 2017-12-20T22:20:48.25
IV.FOSV.EHE. ML:1.8 0.000131 1.54 AML other m 2017-12-20T22:20:48.90
IV.FAGN.HHN. ML:2.4 0.00041000000000000005 1.34 AML other m 2017-12-20T22:20:50.96
IV.SSFR.HHE. ML:2.3 0.0002925 0.2 AML other m 2017-12-20T22:20:51.04
IV.SSFR.HNE. ML:2.3 0.000315 0.22 AML other m 2017-12-20T22:20:51.04
IV.SSFR.HHN. ML:2.3 0.0002935 0.18 AML other m 2017-12-20T22:20:51.21
IV.MURB.HHE. ML:2.3 0.000304 1.48 AML other m 2017-12-20T22:20:51.21
IV.MURB.HNE. ML:2.2 0.0002685 0.28 AML other m 2017-12-20T22:20:51.22
IV.SSFR.HNN. ML:2.4 0.00040100000000000004 0.82 AML other m 2017-12-20T22:20:51.36
IV.FAGN.HHE. ML:2.4 0.00043500000000000006 0.28 AML other m 2017-12-20T22:20:52.14
IV.MURB.HHN. ML:2.2 0.0002605 1 AML other m 2017-12-20T22:20:53.25
IV.PIEI.HHE. ML:1.8 0.00006520000000000001 0.94 AML other m 2017-12-20T22:20:56.41
IV.T0110.HHN. ML:2.1 0.00016 0.36 AML other m 2017-12-20T22:20:57.30
IV.T0110.HHE. ML:2.2 0.0002095 0.56 AML other m 2017-12-20T22:20:57.25
IV.SRES.HHN. ML:1.5 0.000038900000000000004 0.32 AML other m 2017-12-20T22:20:57.90
IV.MURB.HNN. ML:2.3 0.000317 1.02 AML other m 2017-12-20T22:20:58.41
IV.SRES.HHE. ML:1.6 0.000046 1.36 AML other m 2017-12-20T22:20:58.93
IV.CERT.HHN. ML:1.8 0.00006285000000000001 0.34 AML other m 2017-12-20T22:21:00.52
IV.CERT.HHE. ML:1.9 0.00008525 0.78 AML other m 2017-12-20T22:21:01.04
IV.PIEI.HHN. ML:1.6 0.000047149999999999994 1.4 AML other m 2017-12-20T22:21:02.24
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
Waveforms Seismic signals in miniseed + resp format Download