Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 04-02-2023 and time 12:54:27 (Italy) in region 7 km E Norcia (PG)

A magnitude ML 0.9 earthquake occured in region: 7 km E Norcia (PG), on

  • 04-02-2023 11:54:27 (UTC)
  • 04-02-2023 12:54:27 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8120, 13.1810 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 7 4957 4957
Castelsantangelo sul Nera MC 10 281 5238
Arquata del Tronto AP 10 1178 6416
Montegallo AP 13 523 6939
Preci PG 14 724 7663
Accumoli RI 14 667 8330
Ussita MC 15 444 8774
Visso MC 15 1107 9881
Montemonaco AP 16 604 10485
Cascia PG 17 3217 13702
Acquasanta Terme AP 19 2916 16618
Montefortino FM 20 1178 17796

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km E of Foligno (57155 inhabitants)
46 Km W of Teramo (54892 inhabitants)
52 Km NE of Terni (111501 inhabitants)
54 Km NW of L'Aquila (69753 inhabitants)
72 Km E of Perugia (166134 inhabitants)
86 Km W of Montesilvano (53738 inhabitants)
93 Km W of Pescara (121014 inhabitants)
94 Km SW of Ancona (100861 inhabitants)
96 Km NW of Chieti (51815 inhabitants)
98 Km NE of Guidonia Montecelio (88673 inhabitants)
98 Km E of Viterbo (67173 inhabitants)
99 Km NE 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 0.9 2023-02-04
11:54:27		 42.812 13.181 11 2023-02-04
12:00:16		 Sala Sismica INGV-Roma 114043941
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-02-04 11:54:27 ± 0.05
Latitude 42.8120 ± 0.0018
Longitude 13.1810 ± 0.0037
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 114043941

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 290
Semi-minor axis of confidence ellipse (meter) 62
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 294
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) 126
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.05306
Epicentral distance of station farthest from the epicenter (degree) 0.33815
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 114043941
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-02-04 12:00:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.MML1.EHZ. 2023-02-04T11:54:39.89 0.6 undecidable manual S 333 0.3381 50 0 48
IV.CESI.HHZ. 2023-02-04T11:54:38.14 0.3 undecidable manual S 314 0.2797 50 -0.02 73
IV.RM33.EHZ. 2023-02-04T11:54:38.70 0.3 undecidable manual S 175 0.3040 50 -0.18 71
IV.LNSS.HHZ. 2023-02-04T11:54:36.70 0.6 undecidable manual S 206 0.2329 50 -0.09 49
IV.FDMO.HHZ. 2023-02-04T11:54:36.62 0.3 undecidable manual S 343 0.2347 50 -0.21 72
IV.MML1.EHZ. 2023-02-04T11:54:34.54 0.1 undecidable manual P 333 0.3381 50 -0.06 96
IV.RM33.EHZ. 2023-02-04T11:54:34.01 0.1 undecidable manual P 175 0.3040 50 0 97
7F.SIB2.EHE. 2023-02-04T11:54:33.15 0.3 undecidable manual S 49 0.1196 129 -0.16 73
7F.SIB1.EHE. 2023-02-04T11:54:33.02 0.3 undecidable manual S 38 0.1052 133 0.13 74
IV.CESI.HHZ. 2023-02-04T11:54:33.51 0.1 undecidable manual P 314 0.2797 50 -0.09 97
IV.FDMO.HHZ. 2023-02-04T11:54:32.63 0.1 undecidable manual P 343 0.2347 50 -0.2 96
7F.SIB3.EHE. 2023-02-04T11:54:32.32 0.3 undecidable manual S 46 0.0908 137 -0.17 73
IV.LNSS.HHZ. 2023-02-04T11:54:32.79 0.1 undecidable manual P 206 0.2329 50 -0.01 98
IV.MC2.EHZ. 2023-02-04T11:54:32.84 0.3 undecidable manual S 3 0.0998 134 0.11 75
IV.NRCA.HHZ. 2023-02-04T11:54:31.52 0.3 undecidable manual S 294 0.0531 151 -0.12 73
7F.SIB2.EHE. 2023-02-04T11:54:30.86 0.1 undecidable manual P 49 0.1196 129 0.06 100
IV.NRCA.HHZ. 2023-02-04T11:54:30.01 0.1 undecidable manual P 294 0.0531 151 0.18 100
7F.SIB3.EHE. 2023-02-04T11:54:30.41 0.1 undecidable manual P 46 0.0908 137 0.09 100
IV.MC2.EHZ. 2023-02-04T11:54:30.63 0.1 undecidable manual P 3 0.0998 134 0.17 98
7F.SIB1.EHE. 2023-02-04T11:54:30.78 0.1 undecidable manual P 38 0.1052 133 0.23 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.2 0.000217 0.12 AML other m 2023-02-04T11:54:31.64
IV.NRCA.HHE. ML:1.0 0.0001495 1.04 AML other m 2023-02-04T11:54:31.11
IV.MC2.EHE. ML:1.0 0.000126 0.96 AML other m 2023-02-04T11:54:33.94
IV.MC2.EHN. ML:1.0 0.0001275 0.92 AML other m 2023-02-04T11:54:34.37
IV.FDMO.HHN. ML:0.6 0.00002095 0.96 AML other m 2023-02-04T11:54:36.36
IV.FDMO.HHE. ML:0.6 0.0000183 0.84 AML other m 2023-02-04T11:54:37.77
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