Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.2 on date 02-08-2023 and time 23:23:19 (UTC) in region 6 km NW Leonessa (RI)

A magnitude ML 1.2 earthquake occured in region: 6 km NW Leonessa (RI), on

  • 02-08-2023 23:23:19 (UTC)
  • 03-08-2023 01:23:19 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6050, 12.9270 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Leonessa RI 6 2435 2435
Monteleone di Spoleto PG 6 599 3034
Polino TR 7 233 3267
Ferentillo TR 11 1913 5180
Rivodutri RI 11 1253 6433
Morro Reatino RI 12 373 6806
Poggio Bustone RI 12 2055 8861
Poggiodomo PG 12 117 8978
Arrone TR 13 2763 11741
Montefranco TR 13 1276 13017
Labro RI 14 374 13391
Scheggino PG 14 461 13852
Cascia PG 15 3217 17069
Cantalice RI 15 2755 19824
Sant'Anatolia di Narco PG 16 564 20388
Posta RI 17 694 21082
Colli sul Velino RI 17 533 21615
Vallo di Nera PG 19 364 21979
Cittareale RI 19 482 22461
Borbona RI 20 617 23078
Micigliano RI 20 127 23205

Municipalities with at least 50000 inhabitants

An earthquake occurred to
23 Km E of Terni (111501 inhabitants)
43 Km SE of Foligno (57155 inhabitants)
48 Km NW of L'Aquila (69753 inhabitants)
64 Km W of Teramo (54892 inhabitants)
69 Km N of Guidonia Montecelio (88673 inhabitants)
71 Km E of Viterbo (67173 inhabitants)
71 Km SE of Perugia (166134 inhabitants)
72 Km N of Tivoli (56533 inhabitants)
87 Km NE of Roma (2864731 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 1.2 2023-08-02
23:23:19		 42.6047 12.9272 11 2023-08-02
23:48:20		 Sala Sismica INGV-Roma 119807801
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-08-02 23:23:19 ± 0.06
Latitude 42.6047 ± 0.0045
Longitude 12.9272 ± 0.0049
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 119807801

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 445
Semi-minor axis of confidence ellipse (meter) 384
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 218
Circular confidence region, given by single value of horizontal uncertainty (meter) 450.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 144
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) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.08364
Epicentral distance of station farthest from the epicenter (degree) 0.44696
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.2

Field Value
Value 1.2
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 119807801
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-08-02 23:48:20
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SMA1.EHZ. 2023-08-02T23:23:31.14 0.3 undecidable manual S 85 33.4443 50 0.34 67
IV.NRCA.HHZ. 2023-08-02T23:23:29.60 0.1 undecidable manual S 31 29.6481 50 -0.18 94
IV.FDMO.HHZ. 2023-08-02T23:23:28.58 0.1 undecidable manual P 15 49.617 50 0.09 92
IV.RM33.EHZ. 2023-08-02T23:23:28.55 0.1 undecidable manual S 114 25.752 50 -0.21 94
IV.MMO1.EHZ. 2023-08-02T23:23:28.10 0.1 undecidable manual P 45 46.1205 50 0.16 91
IV.NRCA.HHZ. 2023-08-02T23:23:25.22 0.1 undecidable manual P 31 29.6481 50 -0.18 94
IV.ARRO.EHZ. 2023-08-02T23:23:25.36 0.1 undecidable manual S 258 13.4754 129 -0.09 98
IV.SMA1.EHZ. 2023-08-02T23:23:25.90 0.1 undecidable manual P 85 33.4443 50 -0.09 95
IV.LNSS.HHZ. 2023-08-02T23:23:24.27 0.1 undecidable manual S 91 9.2796 140 -0.12 98
IV.RM33.EHZ. 2023-08-02T23:23:24.95 0.1 undecidable manual P 114 25.752 50 0.15 95
IV.GAVE.EHZ. 2023-08-02T23:23:24.57 0.1 undecidable manual S 345 10.0788 138 -0.02 100
IV.LNSS.HHZ. 2023-08-02T23:23:22.40 0.1 undecidable manual P 91 9.2796 140 0.11 98
IV.GAVE.EHZ. 2023-08-02T23:23:22.54 0.1 undecidable manual P 345 10.0788 138 0.14 98
IV.ARRO.EHZ. 2023-08-02T23:23:22.94 0.1 undecidable manual P 258 13.4754 129 0.04 99
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.LNSS.HHN. ML:1.1 0.00015050000000000003 0.12 AML other m 2023-08-02T23:23:24.63
IV.GAVE.EHE. ML:1.3 0.000245 0.9 AML other m 2023-08-02T23:23:24.30
IV.LNSS.HHE. ML:1.2 0.00018099999999999998 0.86 AML other m 2023-08-02T23:23:24.87
IV.GAVE.EHN. ML:1.4 0.00032799999999999995 1.24 AML other m 2023-08-02T23:23:24.87
IV.ARRO.EHN. ML:1.1 0.000134 0.36 AML other m 2023-08-02T23:23:25.67
IV.ARRO.EHE. ML:0.8 0.00007089999999999999 0.14 AML other m 2023-08-02T23:23:26.48
IV.NRCA.HHE. ML:1.3 0.00009265 0.14 AML other m 2023-08-02T23:23:29.80
IV.NRCA.HHN. ML:1.0 0.00004825 1.26 AML other m 2023-08-02T23:23:29.86
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