Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.0 on date 21-12-2019 and time 22:28:32 (UTC) in region 4 km E Sellano (PG)

A magnitude ML 1.0 earthquake occured in region: 4 km E Sellano (PG), on

  • 21-12-2019 22:28:32 (UTC)
  • 21-12-2019 23:28:32 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8880, 12.9830 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
Sellano PG 5 1079 1079
Preci PG 5 724 1803
Cerreto di Spoleto PG 9 1075 2878
Visso MC 10 1107 3985
Monte Cavallo MC 12 145 4130
Norcia PG 14 4957 9087
Castelsantangelo sul Nera MC 14 281 9368
Ussita MC 14 444 9812
Vallo di Nera PG 16 364 10176
Pieve Torina MC 18 1458 11634
Campello sul Clitunno PG 18 2442 14076
Fiordimonte MC 19 202 14278
Cascia PG 19 3217 17495
Trevi PG 19 8469 25964
Poggiodomo PG 20 117 26081

Municipalities with at least 50000 inhabitants

An earthquake occurred to
24 Km E of Foligno (57155 inhabitants)
46 Km NE of Terni (111501 inhabitants)
54 Km E of Perugia (166134 inhabitants)
64 Km W of Teramo (54892 inhabitants)
69 Km NW of L'Aquila (69753 inhabitants)
89 Km NE of Viterbo (67173 inhabitants)
92 Km SW of Ancona (100861 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 1.0 2019-12-21
22:28:32		 42.8882 12.9828 11 2019-12-21
22:46:26		 Sala Sismica INGV-Roma 74870861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2019-12-21 22:28:32 ± 0.08
Latitude 42.8882 ± 0.0036
Longitude 12.9828 ± 0.0061
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 74870861

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 522
Semi-minor axis of confidence ellipse (meter) 358
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 57
Circular confidence region, given by single value of horizontal uncertainty (meter) 520.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 162
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 10
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) 0.28778
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 5
Magnitude information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 74870861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2019-12-21 22:46:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TERO.HHZ. 2019-12-21T22:28:48.00 3.0 undecidable manual P -0.1 0
IV.LNSS.HHZ. 2019-12-21T22:28:43.37 0.1 undecidable manual S 172 31.9458 50 -0.29 92
IV.MMO1.HNN. 2019-12-21T22:28:42.59 0.1 undecidable manual S 87 27.9498 50 0.01 99
IV.EL6.EHZ. 2019-12-21T22:28:41.70 3.0 positive manual P 0.09 0
IV.FDMO.HHZ. 2019-12-21T22:28:39.82 0.1 undecidable manual S 27 18.4704 120 -0.14 98
IV.MC2.EHZ. 2019-12-21T22:28:39.55 3.0 undecidable manual S 0
IV.LNSS.HHZ. 2019-12-21T22:28:39.17 0.1 undecidable manual P 172 31.9458 50 0.21 94
IV.CESI.HHZ. 2019-12-21T22:28:38.66 0.1 undecidable manual S 334 14.4744 126 -0.11 99
IV.NRCA.HNN. 2019-12-21T22:28:38.11 0.1 undecidable manual S 119 12.2766 131 -0.08 100
IV.MMO1.HNN. 2019-12-21T22:28:38.43 0.3 undecidable manual P 87 27.9498 50 0.08 73
IV.CESI.HHZ. 2019-12-21T22:28:36.25 0.1 undecidable manual P 334 14.4744 126 0.11 99
IV.FDMO.HHZ. 2019-12-21T22:28:36.87 0.1 undecidable manual P 27 18.4704 120 0.04 100
IV.NRCA.HNN. 2019-12-21T22:28:35.95 0.1 undecidable manual P 119 12.2766 131 0.15 99
IV.MC2.EHZ. 2019-12-21T22:28:34.92 3.0 undecidable manual P 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CESI.HHE. ML:0.5 0.000027647219999999996 0.5248 AML other m 2019-12-21T22:28:41.72
IV.CESI.HHN. ML:0.7 0.00005198874 0.1792 AML other m 2019-12-21T22:28:38.82
IV.CESI.HNE. ML:0.9 0.00007656064649999999 0.6784 AML other m 2019-12-21T22:28:36.99
IV.CESI.HNN. ML:1.3 0.00018103230000000002 1.2928 AML other m 2019-12-21T22:28:42.57
IV.FDMO.HHE. ML:0.8 0.00004492062 1.3568 AML other m 2019-12-21T22:28:39.21
IV.FDMO.HHN. ML:0.6 0.00003329157670000001 0.1664 AML other m 2019-12-21T22:28:40.01
IV.EL6.EHE. ML:1.7 0.0001391881 0.2688 AML other m 2019-12-21T22:28:44.56
IV.EL6.EHN. ML:1.5 0.00008304105400000001 0.1152 AML other m 2019-12-21T22:28:51.92
IV.TERO.HHE. ML:1.2 0.000027849215000000002 0.9728 AML other m 2019-12-21T22:29:07.42
IV.TERO.HHN. ML:1.1 0.000027259055 1.0368 AML other m 2019-12-21T22:29:18.29
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