Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 27-12-2020 and time 12:41:05 (Italy) in region 8 km W Accumoli (RI)

A magnitude ML 1.1 earthquake occured in region: 8 km W Accumoli (RI), on

  • 27-12-2020 11:41:05 (UTC)
  • 27-12-2020 12:41:05 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.7140, 13.1530 at 9 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
Accumoli RI 8 667 667
Norcia PG 10 4957 5624
Cittareale RI 11 482 6106
Cascia PG 11 3217 9323
Arquata del Tronto AP 14 1178 10501
Amatrice RI 15 2657 13158
Monteleone di Spoleto PG 18 599 13757
Poggiodomo PG 18 117 13874

Municipalities with at least 50000 inhabitants

An earthquake occurred to
45 Km E of Terni (111501 inhabitants)
45 Km NW of L'Aquila (69753 inhabitants)
45 Km SE of Foligno (57155 inhabitants)
46 Km W of Teramo (54892 inhabitants)
76 Km SE of Perugia (166134 inhabitants)
85 Km W of Montesilvano (53738 inhabitants)
87 Km NE of Guidonia Montecelio (88673 inhabitants)
88 Km NE of Tivoli (56533 inhabitants)
91 Km W of Pescara (121014 inhabitants)
92 Km E of Viterbo (67173 inhabitants)
92 Km W 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
Reviewed
Rev100 		ML 1.1 2020-12-27
11:41:05		 42.7137 13.1527 9 2020-12-27
11:53:16		 Sala Sismica INGV-Roma 85754411
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-12-27 11:41:05 ± 0.08
Latitude 42.7137 ± 0.0027
Longitude 13.1527 ± 0.0037
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 85754411

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 289
Semi-minor axis of confidence ellipse (meter) 125
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 282
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 87
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.18
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.37951
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 6
Type of magnitude ML
Reference to an origin 85754411
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-12-27 11:53:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VIVA.HHZ. 2020-12-27T11:41:40.95 3.0 undecidable manual S 0.18 0
IV.RMP.HHZ. 2020-12-27T11:41:24.39 3.0 positive manual P 0.14 0
IV.CSP1.EHZ. 2020-12-27T11:41:19.44 0.6 undecidable manual S 6 42.1245 50 0.09 47
IV.MMO1.HNZ. 2020-12-27T11:41:14.16 0.3 undecidable manual S 34 25.0527 109 -0.09 73
IV.CSP1.EHZ. 2020-12-27T11:41:13.48 0.3 undecidable manual P 6 42.1245 50 0.16 70
IV.GAVE.EHZ. 2020-12-27T11:41:13.23 0.3 undecidable manual S 264 21.1677 112 0.22 71
IV.MC2.EHZ. 2020-12-27T11:41:13.53 0.3 undecidable manual S 8 22.1556 111 0.22 71
IV.MTRA.HNZ. 2020-12-27T11:41:12.51 0.3 undecidable manual S 76 20.4684 113 -0.25 71
IV.LNSS.HHZ. 2020-12-27T11:41:11.05 0.3 undecidable manual S 217 15.3735 119 -0.12 74
IV.SMA1.EHZ. 2020-12-27T11:41:11.92 0.3 undecidable manual S 122 17.4714 116 0.08 74
IV.T1299.EHZ. 2020-12-27T11:41:10.95 0.3 undecidable manual S 130 13.7751 122 0.25 72
IV.MMO1.HNZ. 2020-12-27T11:41:10.15 0.1 undecidable manual P 34 25.0527 109 -0.23 94
IV.NRCA.HHZ. 2020-12-27T11:41:10.80 0.3 undecidable manual S 347 13.6752 122 0.13 74
IV.GAVE.EHZ. 2020-12-27T11:41:09.36 0.1 undecidable manual P 264 21.1677 112 -0.3 94
IV.SMA1.EHZ. 2020-12-27T11:41:09.17 0.1 undecidable manual P 122 17.4714 116 0.19 96
IV.MC2.EHZ. 2020-12-27T11:41:09.84 0.1 undecidable manual P 8 22.1556 111 0.01 99
IV.MTRA.HNZ. 2020-12-27T11:41:09.31 0.1 undecidable manual P 76 20.4684 113 -0.21 96
IV.NRCA.HHZ. 2020-12-27T11:41:08.35 0.1 undecidable manual P 347 13.6752 122 0.04 100
IV.T1299.EHZ. 2020-12-27T11:41:08.44 0.1 undecidable manual P 130 13.7751 122 0.12 98
IV.LNSS.HHZ. 2020-12-27T11:41:08.50 0.1 undecidable manual P 217 15.3735 119 -0.09 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHE. ML:1.2 0.0001676405 0.3008 AML other m 2020-12-27T11:41:11.50
IV.LNSS.HHN. ML:1.2 0.000170021975 0.2176 AML other m 2020-12-27T11:41:11.29
IV.LNSS.HNE. ML:1.1 0.00011806591 0.1664 AML other m 2020-12-27T11:41:11.59
IV.LNSS.HNN. ML:1.3 0.0001950312 0.2304 AML other m 2020-12-27T11:41:11.29
IV.GAVE.EHE. ML:0.8 0.00004704518 0.2368 AML other m 2020-12-27T11:41:13.85
IV.GAVE.EHN. ML:1.0 0.000070051205 0.1216 AML other m 2020-12-27T11:41:13.26
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