Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 19-10-2023 and time 02:05:18 (Italy) in region 2 km W San Casciano dei Bagni (SI)

A magnitude ML 1.8 earthquake occured in region: 2 km W San Casciano dei Bagni (SI), on

  • 19-10-2023 00:05:18 (UTC)
  • 19-10-2023 02:05:18 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8690, 11.8470 at 9 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
San Casciano dei Bagni SI 2 1632 1632
Radicofani SI 7 1097 2729
Cetona SI 11 2755 5484
Allerona TR 12 1794 7278
Proceno VT 12 557 7835
Piancastagnaio SI 13 4230 12065
Fabro TR 14 2876 14941
Sarteano SI 14 4717 19658
Abbadia San Salvatore SI 14 6444 26102
Acquapendente VT 14 5506 31608
Castell'Azzara GR 16 1476 33084
Città della Pieve PG 16 7712 40796
Monteleone d'Orvieto TR 18 1467 42263
Castel Viscardo TR 18 2938 45201
Ficulle TR 18 1669 46870
Chiusi SI 19 8704 55574
Onano VT 20 995 56569

Municipalities with at least 50000 inhabitants

An earthquake occurred to
52 Km SW of Perugia (166134 inhabitants)
54 Km NW of Viterbo (67173 inhabitants)
61 Km E of Grosseto (82087 inhabitants)
65 Km SE of Siena (53903 inhabitants)
67 Km S of Arezzo (99543 inhabitants)
71 Km W of Foligno (57155 inhabitants)
74 Km W of Terni (111501 inhabitants)
86 Km N of Civitavecchia (52991 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 1.8 2023-10-19
00:05:18		 42.8692 11.8467 9 2023-10-19
00:13:11		 Sala Sismica INGV-Roma 122185091
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-10-19 00:05:18 ± 0.15
Latitude 42.8692 ± 0.0162
Longitude 11.8467 ± 0.0098
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 122185091

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1889
Semi-minor axis of confidence ellipse (meter) 319
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 162
Circular confidence region, given by single value of horizontal uncertainty (meter) 1890.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 121
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.34
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.75273
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 8
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 46
Type of magnitude ML
Reference to an origin 122185091
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-10-19 00:13:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SACR.HHZ. 2023-10-19T00:06:07.20 3.0 negative manual Pg 3.94 0
IV.MURB.HHZ. 2023-10-19T00:05:41.10 3.0 undecidable manual S -1.42 0
IV.ATMI.HHZ. 2023-10-19T00:05:38.51 3.0 undecidable manual S 0.51 0
IV.NRCA.HHZ. 2023-10-19T00:05:37.53 3.0 negative manual P -1.69 0
IV.FDMO.HHZ. 2023-10-19T00:05:36.72 3.0 negative manual P -1.87 0
IV.CAFI.HHZ. 2023-10-19T00:05:34.50 0.6 undecidable manual S 11 51.9036 50 -0.44 44
IV.PIEI.HHZ. 2023-10-19T00:05:34.20 3.0 undecidable manual P -0.88 0
IV.CRE.HHZ. 2023-10-19T00:05:33.55 0.6 positive manual P 6 83.5497 50 0.78 37
IV.PARC.HHZ. 2023-10-19T00:05:33.99 3.0 positive manual P -0.38 0
IV.ATPI.EHZ. 2023-10-19T00:05:31.48 3.0 undecidable manual P -1.22 0
IV.ATVO.HHZ. 2023-10-19T00:05:31.19 3.0 negative manual P -0.7 0
IV.RIBO.EHZ.01 2023-10-19T00:05:30.83 0.6 negative manual P 278 65.5899 50 0.84 37
IV.ATMI.HHZ. 2023-10-19T00:05:29.51 3.0 positive manual P 0.01 0
IV.ARCI.HHZ. 2023-10-19T00:05:28.29 0.6 undecidable manual S 266 30.2475 50 -0.86 39
IV.CAFI.HHZ. 2023-10-19T00:05:27.87 0.3 undecidable manual P 11 51.9036 50 -0.02 73
IV.MGAB.HHZ. 2023-10-19T00:05:26.15 0.6 undecidable manual S 77 22.1556 113 -0.44 47
IV.ARCI.HHZ. 2023-10-19T00:05:24.62 0.6 positive manual P 266 30.2475 50 0.08 50
IV.MCIV.CHZ. 2023-10-19T00:05:24.76 0.3 undecidable manual S 234 17.0718 119 -0.26 73
TV.SF11.HHZ. 2023-10-19T00:05:23.76 0.3 undecidable manual S 270 13.6752 125 -0.24 74
IV.MGAB.HHZ. 2023-10-19T00:05:22.99 0.3 undecidable manual P 77 22.1556 113 -0.08 76
IV.MCIV.CHZ. 2023-10-19T00:05:22.32 0.1 positive manual P 234 17.0718 119 0.16 100
IV.SACS.HHZ. 2023-10-19T00:05:21.99 0.3 undecidable manual S 113 5.5944 149 -0.06 78
TV.SF11.HHZ. 2023-10-19T00:05:21.83 0.1 negative manual P 270 13.6752 125 0.26 98
IV.SACS.HHZ. 2023-10-19T00:05:20.82 0.6 undecidable manual P 113 5.5944 149 0.38 49
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SACS.HHN. ML:2.1 0.0023366629999999997 0.1 AML other m 2023-10-19T00:05:22.81
IV.SACS.HNN. ML:2.1 0.002115 0.1 AML other m 2023-10-19T00:05:22.81
TV.SF11.HHN. ML:2.3 0.0019355815 0.48 AML other m 2023-10-19T00:05:24.07
IV.SACS.HHE. ML:2.0 0.0016482375 0.34 AML other m 2023-10-19T00:05:24.19
IV.SACS.HNE. ML:2.0 0.0016550000000000002 0.26 AML other m 2023-10-19T00:05:24.20
TV.SF11.HHE. ML:2.0 0.0011095931500000001 0.18 AML other m 2023-10-19T00:05:24.15
IV.MCIV.CHE. ML:1.9 0.0006479999999999999 0.2 AML other m 2023-10-19T00:05:25.69
IV.MCIV.CHN. ML:1.9 0.00069609255 0.176 AML other m 2023-10-19T00:05:25.60
IV.MGAB.HHE. ML:2.1 0.0009105942499999999 0.32 AML other m 2023-10-19T00:05:28.07
IV.MGAB.HNE. ML:2.1 0.0008185 0.32 AML other m 2023-10-19T00:05:28.23
IV.MGAB.HNN. ML:2.2 0.001002 0.2 AML other m 2023-10-19T00:05:29.09
IV.MGAB.HHN. ML:2.2 0.0010294924 0.2 AML other m 2023-10-19T00:05:29.09
IV.ARCI.HHE. ML:1.5 0.0001570156 0.18 AML other m 2023-10-19T00:05:30.41
IV.ARCI.HHN. ML:1.6 0.000212 0.34 AML other m 2023-10-19T00:05:30.80
IV.CAFI.HHN. ML:1.3 0.000048758335 0.2 AML other m 2023-10-19T00:05:27.81
IV.CAFI.HHE. ML:1.4 0.000063003265 0.32 AML other m 2023-10-19T00:05:37.59
IV.ATMI.HHE. ML:2.2 0.00029619855 0.32 AML other m 2023-10-19T00:05:40.82
IV.ATMI.HHN. ML:2.1 0.00027600000000000004 0.68 AML other m 2023-10-19T00:05:41.36
IV.ATVO.HHN. ML:1.8 0.00008975 1.02 AML other m 2023-10-19T00:05:41.19
IV.ATVO.HHE. ML:1.9 0.00011315866 0.4 AML other m 2023-10-19T00:05:45.09
IV.ATPI.EHN. ML:1.7 0.000068330235 0.4 AML other m 2023-10-19T00:05:45.74
IV.PIEI.HHE. ML:1.7 0.000055057485000000005 0.42 AML other m 2023-10-19T00:05:48.22
IV.ATPI.EHE. ML:1.6 0.00005790546 0.42 AML other m 2023-10-19T00:05:45.26
IV.PIEI.HHN. ML:1.4 0.000029102145000000004 0.28 AML other m 2023-10-19T00:05:49.57
IV.ARCI.HNE. ML:1.5 0.00015407166 0.19 AML other m 2023-10-19T00:05:30.42
IV.ARCI.HNN. ML:1.7 0.000221703 0.35 AML other m 2023-10-19T00:05:30.80
IV.CAFI.HNE. ML:1.4 0.00005946802500000001 0.32 AML other m 2023-10-19T00:05:37.44
IV.CAFI.HNN. ML:1.3 0.00004753661 0.39 AML other m 2023-10-19T00:05:40.07
IV.RIBO.EHE.01 ML:1.9 0.00014904639999999998 1.3 AML other m 2023-10-19T00:05:48.24
IV.RIBO.EHN.01 ML:2.0 0.00016477078250000003 1.36 AML other m 2023-10-19T00:05:36.88
IV.ATVO.HNE. ML:2.1 0.0001784218 0.5 AML other m 2023-10-19T00:05:44.03
IV.ATVO.HNN. ML:2.0 0.0001462251 0.37 AML other m 2023-10-19T00:05:41.99
IV.ATPI.HNE. ML:2.0 0.00014369145 0.71 AML other m 2023-10-19T00:05:53.79
IV.ATPI.HNN. ML:2.0 0.00012454565 0.73 AML other m 2023-10-19T00:05:37.30
IV.CRE.HHE. ML:1.7 0.000065631355 1.1 AML other m 2023-10-19T00:05:38.14
IV.CRE.HHN. ML:1.5 0.00004612035 0.3 AML other m 2023-10-19T00:05:40.73
IV.PARC.HHE. ML:1.7 0.00005483996 1.86 AML other m 2023-10-19T00:06:02.19
IV.PARC.HHN. ML:1.6 0.000046072665 0.54 AML other m 2023-10-19T00:05:53.36
IV.PIEI.HNE. ML:2.0 0.00011362679500000001 0.62 AML other m 2023-10-19T00:06:00.57
IV.PIEI.HNN. ML:2.1 0.00012955615 0.62 AML other m 2023-10-19T00:05:44.71
IV.FDMO.HHE. ML:1.5 0.000029113495000000005 2.18 AML other m 2023-10-19T00:05:36.92
IV.FDMO.HHN. ML:1.4 0.0000264590005 0.34 AML other m 2023-10-19T00:05:51.63
IV.NRCA.HNE. ML:2.0 0.00009982621999999999 0.88 AML other m 2023-10-19T00:06:03.27
IV.NRCA.HNN. ML:2.2 0.00016220391 0.92 AML other m 2023-10-19T00:05:47.26
IV.NRCA.HHE. ML:1.5 0.000028978224999999998 0.36 AML other m 2023-10-19T00:05:52.72
IV.NRCA.HHN. ML:1.4 0.00002704363 0.2 AML other m 2023-10-19T00:05:51.80
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