Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.3 on date 28-09-2023 and time 20:00:17 (UTC) in region 4 km W Bolsena (VT)

A magnitude ML 2.3 earthquake occured in region: 4 km W Bolsena (VT), on

  • 28-09-2023 20:00:17 (UTC)
  • 28-09-2023 22:00:17 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6570, 11.9400 at 5 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
Bolsena VT 4 3991 3991
San Lorenzo Nuovo VT 4 2091 6082
Grotte di Castro VT 6 2683 8765
Castel Giorgio TR 7 2131 10896
Gradoli VT 7 1353 12249
Latera VT 10 836 13085
Onano VT 11 995 14080
Acquapendente VT 12 5506 19586
Castel Viscardo TR 12 2938 22524
Capodimonte VT 12 1731 24255
Bagnoregio VT 13 3650 27905
Marta VT 14 3499 31404
Valentano VT 14 2868 34272
Porano TR 14 1966 36238
Lubriano VT 14 909 37147
Proceno VT 14 557 37704
Montefiascone VT 15 13432 51136
Orvieto TR 16 20630 71766
Allerona TR 18 1794 73560
Piansano VT 18 2079 75639
Celleno VT 19 1355 76994
Sorano GR 19 3428 80422
Ischia di Castro VT 19 2326 82748

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km NW of Viterbo (67173 inhabitants)
59 Km W of Terni (111501 inhabitants)
62 Km SW of Perugia (166134 inhabitants)
64 Km N of Civitavecchia (52991 inhabitants)
69 Km E of Grosseto (82087 inhabitants)
71 Km W of Foligno (57155 inhabitants)
89 Km SE of Siena (53903 inhabitants)
90 Km S of Arezzo (99543 inhabitants)
96 Km NW of Roma (2864731 inhabitants)
98 Km NW of Guidonia Montecelio (88673 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 2.3 2023-09-28
20:00:17		 42.6567 11.9402 5 2023-09-28
20:25:42		 Sala Sismica INGV-Roma 121558951
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-28 20:00:17 ± 0.12
Latitude 42.6567 ± 0.0054
Longitude 11.9402 ± 0.0098
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121558951

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 850
Semi-minor axis of confidence ellipse (meter) 560
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 264
Circular confidence region, given by single value of horizontal uncertainty (meter) 850.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 143
Number of associated phases, regardless of their use for origin computation 42
Number of defining phases 23
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) 1.01444
Number of stations at which the event was observed 30
Number of stations from which data was used for origin computation 15
Magnitude information

ML:2.3

Field Value
Value 2.3
Uncertainty 0.3
Num. used stations 62
Type of magnitude ML
Reference to an origin 121558951
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-28 20:25:42
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.VARE.HHZ. 2023-09-28T20:01:30.62 3.0 undecidable manual Pg 12.34 0
OX.MARN.HHZ. 2023-09-28T20:01:11.96 3.0 undecidable manual Pg 6.18 0
IV.PIEI.HHZ. 2023-09-28T20:00:52.93 3.0 undecidable manual S 0.36 0
IV.CRE.HHZ. 2023-09-28T20:00:51.45 0.6 undecidable manual S 0 106.7154 50 1.23 28
IV.NRCA.HHZ. 2023-09-28T20:00:49.80 3.0 undecidable manual S 0.1 0
IV.ATVO.HHZ. 2023-09-28T20:00:47.30 3.0 undecidable manual S 0.64 0
IV.ATMI.HHZ. 2023-09-28T20:00:43.47 0.6 undecidable manual S 19 79.7646 50 0.46 41
IV.MF5.EHZ. 2023-09-28T20:00:41.54 3.0 negative manual P 1.1 0
IV.CAFI.HHZ. 2023-09-28T20:00:40.78 1.0 undecidable manual S 2 74.6697 50 -0.87 18
IV.MMO1.EHZ. 2023-09-28T20:00:39.00 3.0 negative manual P 0.26 0
IV.CRE.HHZ. 2023-09-28T20:00:37.51 0.6 negative manual P 0 106.7154 50 0.94 32
IV.PIEI.HHZ. 2023-09-28T20:00:37.34 3.0 positive manual P 0.07 0
IV.FIAM.HHZ. 2023-09-28T20:00:37.66 3.0 negative manual P 0.55 0
IV.PARC.HHZ. 2023-09-28T20:00:37.46 1.0 negative manual P 12 112.5984 50 -0.02 21
IV.CSP1.EHZ. 2023-09-28T20:00:37.84 3.0 undecidable manual P -0.42 0
IV.SNTG.HHZ. 2023-09-28T20:00:37.74 3.0 undecidable manual P 1.01 0
IV.FDMO.HHZ. 2023-09-28T20:00:36.98 3.0 positive manual P 0.59 0
IV.MOMA.HHZ. 2023-09-28T20:00:36.74 3.0 undecidable manual S 0.14 0
IV.CSNT.HHZ. 2023-09-28T20:00:36.23 1.0 positive manual P 330 104.8173 50 -0.04 21
IV.TRIF.CHZ. 2023-09-28T20:00:35.91 0.1 positive manual P 301 98.4237 50 0.61 75
IV.NRCA.HHZ. 2023-09-28T20:00:35.45 3.0 undecidable manual P -0.21 0
IV.ATPI.EHZ. 2023-09-28T20:00:35.78 3.0 positive manual P 0.7 0
IV.BARO.EHZ. 2023-09-28T20:00:34.25 0.6 undecidable manual S 169 46.2204 96 0.19 47
IV.CASP.HHZ. 2023-09-28T20:00:34.17 0.1 negative manual P 280 88.8444 50 0.36 83
IV.ASSB.HHZ. 2023-09-28T20:00:33.54 3.0 negative manual P 2.22 0
IV.ATVO.HHZ. 2023-09-28T20:00:33.36 3.0 undecidable manual P -0.59 0
IV.ATCC.EHZ. 2023-09-28T20:00:32.67 3.0 negative manual P -0.15 0
IV.RIBO.EHZ.01 2023-09-28T20:00:32.63 0.6 positive manual P 294 79.6647 50 0.24 43
IV.ATMI.HHZ. 2023-09-28T20:00:31.77 0.3 negative manual P 19 79.7646 50 -0.63 58
IV.CAFI.HHZ. 2023-09-28T20:00:30.69 0.6 undecidable manual P 2 74.6697 50 -0.93 35
IV.TOLF.HHZ. 2023-09-28T20:00:30.26 0.1 negative manual P 176 65.8896 50 -0.02 93
IV.MGAB.HHZ. 2023-09-28T20:00:29.20 0.3 undecidable manual S 26 31.6461 99 0.16 72
IV.MOMA.HHZ. 2023-09-28T20:00:28.17 3.0 undecidable manual P -0.13 0
TV.SF11.HHZ. 2023-09-28T20:00:28.85 0.3 undecidable manual S 318 31.746 99 -0.21 71
IV.BARO.EHZ. 2023-09-28T20:00:27.18 0.1 undecidable manual P 169 46.2204 96 -0.06 95
IV.MCIV.CHZ. 2023-09-28T20:00:26.99 0.6 undecidable manual S 302 25.3524 101 0.09 49
IV.ARCI.HHZ. 2023-09-28T20:00:26.07 0.1 negative manual P 300 43.623 97 -0.65 83
IV.SACS.HHZ. 2023-09-28T20:00:25.71 0.1 undecidable manual S 353 21.4674 103 0.14 98
TV.SF11.HHZ. 2023-09-28T20:00:24.18 0.6 negative manual P 318 31.746 99 -0.17 48
IV.MGAB.HHZ. 2023-09-28T20:00:24.05 0.1 positive manual P 26 31.6461 99 -0.29 93
IV.SACS.HHZ. 2023-09-28T20:00:22.29 0.1 undecidable manual P 353 21.4674 103 -0.05 100
IV.MCIV.CHZ. 2023-09-28T20:00:22.96 1.0 negative manual P 302 25.3524 101 -0.14 24
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SACS.HHE. ML:2.9 0.005685000000000001 1.68 AML other m 2023-09-28T20:00:25.86
IV.SACS.HNE. ML:2.9 0.00574 1.68 AML other m 2023-09-28T20:00:25.02
IV.SACS.HNN. ML:2.6 0.0028399999999999996 1.2 AML other m 2023-09-28T20:00:26.68
IV.SACS.HHN. ML:2.6 0.0029249999999999996 1.24 AML other m 2023-09-28T20:00:26.68
TV.SF11.HHN. ML:2.5 0.001655 0.4 AML other m 2023-09-28T20:00:29.15
IV.MCIV.CHE. ML:2.5 0.00213 0.82 AML other m 2023-09-28T20:00:29.11
IV.MCIV.CHN. ML:2.4 0.001635 0.28 AML other m 2023-09-28T20:00:30.35
IV.MGAB.HHE. ML:2.7 0.0026399999999999996 0.2 AML other m 2023-09-28T20:00:32.23
IV.MGAB.HNE. ML:2.7 0.002415 0.2 AML other m 2023-09-28T20:00:32.23
IV.MGAB.HHN. ML:2.8 0.002875 0.2 AML other m 2023-09-28T20:00:32.38
IV.MGAB.HNN. ML:2.8 0.00277 0.2 AML other m 2023-09-28T20:00:32.38
TV.SF11.HHE. ML:2.7 0.002185 1.66 AML other m 2023-09-28T20:00:34.00
IV.BARO.HNN. ML:2.2 0.000517 0.66 AML other m 2023-09-28T20:00:35.34
IV.BARO.EHN. ML:2.2 0.000484 0.64 AML other m 2023-09-28T20:00:35.01
IV.ARCI.HHN. ML:2.2 0.0004605 1.78 AML other m 2023-09-28T20:00:35.02
IV.BARO.EHE. ML:1.3 0.00006495 0.64 AML other m 2023-09-28T20:00:35.20
IV.ARCI.HHE. ML:2.2 0.0005195 1.56 AML other m 2023-09-28T20:00:36.99
IV.MOMA.HHN. ML:2.2 0.0003715 0.18 AML other m 2023-09-28T20:00:38.23
IV.MOMA.HHE. ML:2.3 0.00045850000000000003 0.34 AML other m 2023-09-28T20:00:38.43
IV.MOMA.HNN. ML:2.3 0.000435 0.86 AML other m 2023-09-28T20:00:38.85
IV.MOMA.HNE. ML:2.3 0.000498 1.42 AML other m 2023-09-28T20:00:40.21
IV.CAFI.HHE. ML:2.5 0.000488 0.22 AML other m 2023-09-28T20:00:41.67
IV.CAFI.HHN. ML:2.3 0.0003215 0.24 AML other m 2023-09-28T20:00:42.14
IV.BARO.HNE. ML:2.2 0.0004735 0.52 AML other m 2023-09-28T20:00:43.22
IV.TOLF.HHN. ML:2.3 0.00040149999999999995 0.86 AML other m 2023-09-28T20:00:44.54
IV.TOLF.HHE. ML:2.3 0.00035499999999999996 0.66 AML other m 2023-09-28T20:00:44.86
IV.ATMI.HHN. ML:3.0 0.00143 0.3 AML other m 2023-09-28T20:00:46.70
IV.ATMI.HHE. ML:3.0 0.001405 0.3 AML other m 2023-09-28T20:00:46.52
IV.ATCC.HNE. ML:2.6 0.0005335000000000001 0.52 AML other m 2023-09-28T20:00:46.59
IV.ATCC.EHE. ML:2.5 0.00047099999999999996 0.56 AML other m 2023-09-28T20:00:46.58
IV.ATVO.HHE. ML:2.5 0.00036350000000000005 0.38 AML other m 2023-09-28T20:00:47.57
IV.ATVO.HHN. ML:2.4 0.00026700000000000004 0.54 AML other m 2023-09-28T20:00:49.03
IV.CASP.HHN. ML:2.1 0.000153 1.62 AML other m 2023-09-28T20:00:49.13
IV.RIBO.EHN.01 ML:2.1 0.000168065 0.54 AML other m 2023-09-28T20:00:49.23
IV.ATPI.EHN. ML:2.4 0.00026900000000000003 0.38 AML other m 2023-09-28T20:00:50.67
IV.RIBO.EHE.01 ML:2.2 0.000199 1.24 AML other m 2023-09-28T20:00:50.19
IV.ATPI.EHE. ML:2.4 0.000279 0.66 AML other m 2023-09-28T20:00:51.25
IV.ATCC.EHN. ML:2.5 0.00040100000000000004 0.62 AML other m 2023-09-28T20:00:51.60
IV.ATCC.HNN. ML:2.5 0.00042500000000000003 0.6 AML other m 2023-09-28T20:00:51.61
IV.CASP.HHE. ML:1.8 0.0000757 0.5 AML other m 2023-09-28T20:00:51.19
IV.TRIF.CHN. ML:2.0 0.00009685 0.76 AML other m 2023-09-28T20:00:52.77
IV.FDMO.HHE. ML:2.0 0.00010355000000000001 1.46 AML other m 2023-09-28T20:00:52.84
IV.TRIF.CHE. ML:1.9 0.00008705 0.46 AML other m 2023-09-28T20:00:52.73
IV.CRE.HHN. ML:2.2 0.00015900000000000002 1.3 AML other m 2023-09-28T20:00:53.69
IV.SNTG.HHE. ML:2.1 0.00010700000000000001 1.52 AML other m 2023-09-28T20:00:53.92
IV.PIEI.HHN. ML:2.1 0.00011899999999999999 1.4 AML other m 2023-09-28T20:00:53.75
IV.CRE.HHE. ML:2.1 0.00011999999999999999 0.76 AML other m 2023-09-28T20:00:53.79
IV.CSNT.HHE. ML:1.9 0.00006829999999999999 1.7 AML other m 2023-09-28T20:00:54.99
IV.PIEI.HHE. ML:2.3 0.00018099999999999998 1.08 AML other m 2023-09-28T20:00:54.77
IV.SNTG.HHN. ML:2.1 0.00010865 0.7 AML other m 2023-09-28T20:00:54.26
IV.CSNT.HHN. ML:1.7 0.0000475 0.84 AML other m 2023-09-28T20:00:54.38
IV.PARC.HHE. ML:2.2 0.000141 0.74 AML other m 2023-09-28T20:00:54.95
IV.PARC.HHN. ML:2.3 0.000155 0.34 AML other m 2023-09-28T20:00:55.83
IV.NRCA.HHE. ML:2.0 0.00009795 0.6 AML other m 2023-09-28T20:00:55.94
IV.FDMO.HHN. ML:2.0 0.00010625 1.16 AML other m 2023-09-28T20:00:56.80
IV.FIAM.HHN. ML:2.1 0.00010925 0.82 AML other m 2023-09-28T20:00:56.47
IV.CSP1.EHE. ML:2.7 0.0004285 0.46 AML other m 2023-09-28T20:00:57.83
IV.CSP1.EHN. ML:2.8 0.00046699999999999997 1.38 AML other m 2023-09-28T20:00:57.85
IV.NRCA.HHN. ML:2.1 0.000122 0.8 AML other m 2023-09-28T20:00:57.48
IV.MMO1.EHN. ML:2.5 0.0002445 0.46 AML other m 2023-09-28T20:00:59.03
IV.MMO1.EHE. ML:2.4 0.00022 0.64 AML other m 2023-09-28T20:01:00.69
IV.FIAM.HHE. ML:2.1 0.00011599999999999999 0.84 AML other m 2023-09-28T20:01:01.61
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
Waveforms Seismic signals in miniseed + resp format Download