Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.1 on date 23-01-2020 and time 04:15:18 (Italy) in region 4 km N Norcia (PG)

A magnitude ML 1.1 earthquake occured in region: 4 km N Norcia (PG), on

  • 23-01-2020 03:15:18 (UTC)
  • 23-01-2020 04:15:18 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8290, 13.0870 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
Norcia PG 4 4957 4957
Preci PG 7 724 5681
Castelsantangelo sul Nera MC 9 281 5962
Visso MC 11 1107 7069
Ussita MC 14 444 7513
Cascia PG 14 3217 10730
Cerreto di Spoleto PG 14 1075 11805
Sellano PG 15 1079 12884
Poggiodomo PG 18 117 13001
Arquata del Tronto AP 18 1178 14179
Vallo di Nera PG 19 364 14543
Monte Cavallo MC 20 145 14688
Accumoli RI 20 667 15355

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
47 Km NE of Terni (111501 inhabitants)
54 Km W of Teramo (54892 inhabitants)
59 Km NW of L'Aquila (69753 inhabitants)
65 Km E of Perugia (166134 inhabitants)
92 Km NE of Viterbo (67173 inhabitants)
94 Km W of Montesilvano (53738 inhabitants)
95 Km SW of Ancona (100861 inhabitants)
97 Km NE of Guidonia Montecelio (88673 inhabitants)
99 Km N of Tivoli (56533 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 2020-01-23
03:15:18		 42.8288 13.0872 11 2020-01-23
04:39:07		 Sala Sismica INGV-Roma 75758591
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-01-23 03:15:18 ± 0.1
Latitude 42.8288 ± 0.0045
Longitude 13.0872 ± 0.0135
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 75758591

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1086
Semi-minor axis of confidence ellipse (meter) 399
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 101
Circular confidence region, given by single value of horizontal uncertainty (meter) 1090.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 171
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.02068
Epicentral distance of station farthest from the epicenter (degree) 0.33275
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.2
Num. used stations 2
Type of magnitude ML
Reference to an origin 75758591
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-01-23 04:39:07
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.RM33.EHZ. 2020-01-23T03:15:31.26 0.6 undecidable manual S 164 36.9297 90 0.04 49
IV.CSP1.EHZ. 2020-01-23T03:15:29.76 0.6 undecidable manual S 18 30.747 90 0.21 48
IV.FDMO.HHZ. 2020-01-23T03:15:27.09 0.3 undecidable manual S 0 23.0547 91 -0.41 69
IV.LNSS.HHE. 2020-01-23T03:15:27.90 0.6 undecidable manual S 189 25.3524 91 -0.22 48
IV.MMO1.EHZ. 2020-01-23T03:15:26.62 0.6 undecidable manual S 68 20.9679 91 -0.34 48
IV.RM33.EHZ. 2020-01-23T03:15:26.15 1.0 undecidable manual P 164 36.9297 90 0.14 24
IV.CSP1.EHZ. 2020-01-23T03:15:25.34 1.0 negative manual P 18 30.747 90 0.29 24
IV.LNSS.HHE. 2020-01-23T03:15:24.31 0.1 undecidable manual P 189 25.3524 91 0.09 100
IV.FDMO.HHZ. 2020-01-23T03:15:24.10 0.6 positive manual P 0 23.0547 91 0.23 49
IV.MC2.EHZ. 2020-01-23T03:15:24.78 0.1 undecidable manual S 42 12.3765 108 0.12 100
IV.MMO1.EHZ. 2020-01-23T03:15:23.53 1.0 undecidable manual P 68 20.9679 91 -0.02 25
IV.NRCA.HHZ. 2020-01-23T03:15:22.41 0.6 undecidable manual S 77 2.2977 165 -0.45 49
IV.MC2.EHZ. 2020-01-23T03:15:22.54 0.6 positive manual P 42 12.3765 108 0.31 48
IV.NRCA.HHZ. 2020-01-23T03:15:21.17 0.6 undecidable manual P 77 2.2977 165 -0.01 53
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.2 0.000241 0.08 AML other m 2020-01-23T03:15:22.57
IV.NRCA.HHE. ML:1.0 0.00014600000000000003 0.98 AML other m 2020-01-23T03:15:23.58
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