Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 07-04-2023 and time 20:36:44 (UTC) in region 3 km SE Norcia (PG)

A magnitude ML 0.5 earthquake occured in region: 3 km SE Norcia (PG), on

  • 07-04-2023 20:36:44 (UTC)
  • 07-04-2023 22:36:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7720, 13.1220 at 11 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 3 4957 4957
Cascia PG 11 3217 8174
Accumoli RI 13 667 8841
Preci PG 14 724 9565
Castelsantangelo sul Nera MC 14 281 9846
Arquata del Tronto AP 14 1178 11024
Poggiodomo PG 17 117 11141
Cittareale RI 17 482 11623
Cerreto di Spoleto PG 18 1075 12698
Visso MC 18 1107 13805
Montegallo AP 19 523 14328
Ussita MC 19 444 14772
Monteleone di Spoleto PG 19 599 15371

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km SE of Foligno (57155 inhabitants)
45 Km NE of Terni (111501 inhabitants)
49 Km W of Teramo (54892 inhabitants)
52 Km NW of L'Aquila (69753 inhabitants)
70 Km SE of Perugia (166134 inhabitants)
89 Km W of Montesilvano (53738 inhabitants)
92 Km NE of Guidonia Montecelio (88673 inhabitants)
92 Km E of Viterbo (67173 inhabitants)
94 Km N of Tivoli (56533 inhabitants)
96 Km W of Pescara (121014 inhabitants)
98 Km W of Chieti (51815 inhabitants)
99 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
Bulletin
Rev1000 		ML 0.5 2023-04-07
20:36:44		 42.7725 13.1217 11 2024-03-01
17:18:06		 Bollettino Sismico Italiano INGV 117142651
Reviewed
Rev100 		Md 1.3
ML 1.2 		2023-04-07
20:36:44		 42.7718 13.1073 11 2023-04-07
20:41:46		 Sala Sismica INGV-Roma 116153481
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-07 20:36:44 ± 0.04
Latitude 42.7725 ± 0.0018
Longitude 13.1217 ± 0.0037
Depth (km) 11 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 117142651

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 251
Semi-minor axis of confidence ellipse (meter) 157
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 296
Circular confidence region, given by single value of horizontal uncertainty (meter) 250.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 82
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.12
Epicentral distance of station closest to the epicenter (degree) 0.06115
Epicentral distance of station farthest from the epicenter (degree) 0.28149
Number of stations at which the event was observed 11
Number of stations from which data was used for origin computation 11
Magnitudes information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.3
Num. used stations 10
Type of magnitude ML
Reference to an origin 117142651
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-01-18 11:03:32

ML:1.2

Field Value
Value 1.2
Uncertainty 0.4
Num. used stations 6
Type of magnitude ML
Reference to an origin 116153481
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-07 20:41:46

Md:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 5
Type of magnitude Md
Reference to an origin 116153481
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-07 20:41:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CESI.HHE. 2023-04-07T20:36:55.87 0.3 undecidable manual S 326 31.2465 50 0.08 72
IV.RM33.EHZ. 2023-04-07T20:36:55.55 0.3 undecidable manual S 165 30.2475 50 0.03 73
IV.FDMO.HHZ. 2023-04-07T20:36:55.27 0.6 undecidable manual S 355 29.4483 50 -0.03 49
IV.SMA1.EHZ. 2023-04-07T20:36:53.73 0.3 undecidable manual S 132 23.4543 50 0 74
IV.MMO1.EHZ. 2023-04-07T20:36:53.25 0.3 undecidable manual S 50 21.867 50 -0.03 74
IV.GAVE.EHN. 2023-04-07T20:36:52.59 0.6 undecidable manual S 244 20.5683 50 -0.35 46
IV.LNSS.HHZ. 2023-04-07T20:36:52.97 0.3 undecidable manual S 199 19.9689 50 0.19 72
7F.SIB2.EHE. 2023-04-07T20:36:52.81 0.6 undecidable manual S 48 19.869 50 0.07 49
7F.SIB1.EHE. 2023-04-07T20:36:52.55 0.6 undecidable manual S 42 18.1707 121 0.26 47
IV.CESI.HHE. 2023-04-07T20:36:51.23 0.6 undecidable manual P 326 31.2465 50 0.02 49
7F.SIB3.EHN. 2023-04-07T20:36:51.62 0.6 undecidable manual S 47 16.5723 123 -0.21 48
IV.FDMO.HHZ. 2023-04-07T20:36:50.91 0.1 undecidable manual P 355 29.4483 50 -0.02 98
IV.SMA1.EHZ. 2023-04-07T20:36:50.06 0.3 undecidable manual P 132 23.4543 50 0.05 74
IV.RM33.EHZ. 2023-04-07T20:36:50.89 0.3 undecidable manual P 165 30.2475 50 -0.16 71
IV.LNSS.HHZ. 2023-04-07T20:36:49.46 0.3 positive manual P 199 19.9689 50 -0.01 75
IV.MMO1.EHZ. 2023-04-07T20:36:49.81 0.3 undecidable manual P 50 21.867 50 0.05 74
7F.SIB2.EHE. 2023-04-07T20:36:49.24 0.1 undecidable manual P 48 19.869 50 -0.21 96
7F.SIB1.EHE. 2023-04-07T20:36:49.20 0.1 undecidable manual P 42 18.1707 121 0.02 100
IV.NRCA.HHZ. 2023-04-07T20:36:49.33 0.3 undecidable manual S 355 6.7932 148 -0.06 75
IV.GAVE.EHN. 2023-04-07T20:36:49.61 0.1 undecidable manual P 244 20.5683 50 0.05 99
7F.SIB3.EHN. 2023-04-07T20:36:48.95 0.1 undecidable manual P 47 16.5723 123 0.04 100
IV.NRCA.HHZ. 2023-04-07T20:36:47.70 0.1 undecidable manual P 355 6.7932 148 0.19 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.NRCA.HHN. ML:1.2 0.000235 0.08 AML other m 2023-04-07T20:36:49.42
IV.NRCA.HHE. ML:1.1 0.0001815 0.1 AML other m 2023-04-07T20:36:49.55
IV.MMO1.EHE. ML:0.5 0.000020948125000000002 2.816 AML other m 2023-04-07T20:36:52.76
IV.LNSS.HHE. ML:0.4 0.000018735695 0.6784 AML other m 2023-04-07T20:36:53.18
IV.MMO1.EHN. ML:0.5 0.00002094427 0.7296 AML other m 2023-04-07T20:36:53.61
IV.LNSS.HHN. ML:0.7 0.0000329288 0.5632 AML other m 2023-04-07T20:36:53.58
IV.SMA1.EHE. ML:0.4 0.000016269587 0.9088 AML other m 2023-04-07T20:36:54.82
IV.SMA1.EHN. ML:0.2 0.000011704945000000002 1.28 AML other m 2023-04-07T20:36:54.57
IV.FDMO.HHE. ML:0.5 0.000014965 1.14 AML other m 2023-04-07T20:36:55.38
IV.FDMO.HHN. ML:0.3 0.000011599999999999999 0.48 AML other m 2023-04-07T20:36:55.74
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