Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 29-09-2023 and time 14:27:44 (Italy) in region 4 km W Bolsena (VT)

A magnitude ML 2.0 earthquake occured in region: 4 km W Bolsena (VT), on

  • 29-09-2023 12:27:44 (UTC)
  • 29-09-2023 14:27:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6530, 11.9460 at 7 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 5 2091 6082
Grotte di Castro VT 7 2683 8765
Castel Giorgio TR 7 2131 10896
Gradoli VT 7 1353 12249
Latera VT 10 836 13085
Onano VT 12 995 14080
Capodimonte VT 12 1731 15811
Acquapendente VT 12 5506 21317
Castel Viscardo TR 12 2938 24255
Bagnoregio VT 13 3650 27905
Marta VT 13 3499 31404
Lubriano VT 13 909 32313
Porano TR 13 1966 34279
Valentano VT 14 2868 37147
Montefiascone VT 15 13432 50579
Proceno VT 15 557 51136
Orvieto TR 15 20630 71766
Piansano VT 18 2079 73845
Allerona TR 18 1794 75639
Celleno VT 18 1355 76994
Sorano GR 19 3428 80422
Ischia di Castro VT 19 2326 82748

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km NW of Viterbo (67173 inhabitants)
58 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)
91 Km S of Arezzo (99543 inhabitants)
95 Km NW of Roma (2864731 inhabitants)
97 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 2.0 2023-09-29
12:27:44		 42.6532 11.9455 7 2023-09-29
13:07:04		 Sala Sismica INGV-Roma 121584461
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-29 12:27:44 ± 0.23
Latitude 42.6532 ± 0.0099
Longitude 11.9455 ± 0.0110
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121584461

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 883
Semi-minor axis of confidence ellipse (meter) 879
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 339
Circular confidence region, given by single value of horizontal uncertainty (meter) 880.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 124
Number of associated phases, regardless of their use for origin computation 31
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.72036
Number of stations at which the event was observed 24
Number of stations from which data was used for origin computation 9
Magnitude information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.3
Num. used stations 26
Type of magnitude ML
Reference to an origin 121584461
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-29 13:07:04
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ORI.HHZ. 2023-09-29T12:29:32.00 3.0 undecidable manual Sn -4.25 0
IV.ACATE.EHZ. 2023-09-29T12:29:06.60 3.0 positive manual Pn -3.06 0
IV.SPS2.HHZ. 2023-09-29T12:29:01.52 3.0 negative manual Pg 8.45 0
IV.AIO.HHZ. 2023-09-29T12:28:46.17 3.0 undecidable manual Pn -9.99 0
IV.PIPA.HHZ. 2023-09-29T12:28:41.44 3.0 undecidable manual Pn -9.99 0
GE.MATE.HHZ. 2023-09-29T12:28:41.13 3.0 negative manual Pn -3.31 0
GU.GRAM.HHZ. 2023-09-29T12:28:37.33 3.0 undecidable manual Sn -8.76 0
IV.BAG8.EHZ. 2023-09-29T12:28:29.66 3.0 negative manual Pn -3.7 0
IV.CTI.HHZ. 2023-09-29T12:28:29.21 3.0 undecidable manual Pn -5.12 0
IV.SGTA.HHZ. 2023-09-29T12:28:28.88 3.0 positive manual Pg -0.15 0
ZO.PDN2.HNZ. 2023-09-29T12:28:26.39 3.0 undecidable manual Pg -1.57 0
IV.CPOZ.HNZ. 2023-09-29T12:28:21.15 3.0 undecidable manual Pg -0.6 0
IV.PRMA.HHZ. 2023-09-29T12:28:12.06 3.0 negative manual Pn -8.51 0
IV.ATMI.HHZ. 2023-09-29T12:28:09.99 0.3 undecidable manual S 19 79.9644 50 0.85 53
IV.CAFI.HHZ. 2023-09-29T12:28:08.11 0.6 undecidable manual S 1 75.0693 50 0.29 43
IV.ATMI.HHZ. 2023-09-29T12:27:59.22 0.3 undecidable manual P 19 79.9644 50 0.56 60
IV.BRSN.HNZ. 2023-09-29T12:27:59.91 3.0 positive manual Pn -9.99 0
IV.CASP.HHZ. 2023-09-29T12:27:58.50 3.0 undecidable manual Pg 0.4 0
IV.ARCI.HHZ. 2023-09-29T12:27:58.89 0.3 undecidable manual S 300 44.2224 50 -0.7 60
IV.CAFI.HHZ. 2023-09-29T12:27:57.29 0.1 undecidable manual P 1 75.0693 50 -0.61 79
IV.TOLF.HHZ. 2023-09-29T12:27:56.78 0.1 undecidable manual P 176 65.49 50 0.35 87
TV.SF11.HHZ. 2023-09-29T12:27:55.96 0.3 undecidable manual S 318 32.3454 102 0.17 72
IV.MGAB.HHZ. 2023-09-29T12:27:55.42 0.3 undecidable manual S 25 31.8459 102 -0.21 71
IV.MOMA.HHZ. 2023-09-29T12:27:54.44 0.3 undecidable manual P 72 53.6019 50 -0.15 69
IV.MCIV.CHZ. 2023-09-29T12:27:54.00 0.3 undecidable manual S 303 25.9518 104 0.35 70
IV.SACS.HHZ. 2023-09-29T12:27:52.47 0.3 undecidable manual S 352 21.9669 107 0.17 73
IV.ARCI.HHZ. 2023-09-29T12:27:52.88 0.3 undecidable manual P 300 44.2224 50 -0.27 69
TV.SF11.HHZ. 2023-09-29T12:27:50.81 0.3 undecidable manual P 318 32.3454 102 -0.14 72
IV.MGAB.HHZ. 2023-09-29T12:27:50.39 0.1 undecidable manual P 25 31.8459 102 -0.47 90
IV.MCIV.CHZ. 2023-09-29T12:27:49.88 0.3 undecidable manual P 303 25.9518 104 0.16 73
IV.SACS.HHZ. 2023-09-29T12:27:48.98 0.1 undecidable manual P 352 21.9669 107 0.04 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SACS.HNN. ML:2.0 0.00073435625 0.3072 AML other m 2023-09-29T12:27:52.69
IV.SACS.HHN. ML:1.9 0.0006088255 0.3008 AML other m 2023-09-29T12:27:52.69
IV.SACS.HNE. ML:2.1 0.0009725 0.22 AML other m 2023-09-29T12:27:53.05
IV.SACS.HHE. ML:2.1 0.0009285 0.24 AML other m 2023-09-29T12:27:53.16
IV.MCIV.CHE. ML:1.7 0.0003005 1.02 AML other m 2023-09-29T12:27:54.37
IV.MGAB.HHN. ML:2.1 0.00066258765 0.16 AML other m 2023-09-29T12:27:56.58
IV.MGAB.HNN. ML:2.1 0.0006274309999999999 0.1792 AML other m 2023-09-29T12:27:56.57
IV.MGAB.HNE. ML:2.1 0.0006698633499999999 0.16 AML other m 2023-09-29T12:27:57.04
IV.MGAB.HHE. ML:2.2 0.0007171138000000001 0.16 AML other m 2023-09-29T12:27:57.04
IV.MCIV.CHN. ML:1.6 0.00021338200000000002 0.1472 AML other m 2023-09-29T12:27:54.88
IV.ARCI.HHE. ML:1.4 0.00007799067 0.2176 AML other m 2023-09-29T12:28:01.16
IV.ARCI.HHN. ML:1.5 0.00009495 0.36 AML other m 2023-09-29T12:28:02.07
IV.BARO.EHN. ML:2.5 0.000996 0.22 AML other m 2023-09-29T12:28:04.22
IV.BARO.HNN. ML:2.5 0.001015 0.5 AML other m 2023-09-29T12:28:04.36
IV.BARO.EHE. ML:1.7 0.00013266688999999997 0.1792 AML other m 2023-09-29T12:28:05.78
IV.BARO.HNE. ML:2.4 0.0008427154999999999 0.352 AML other m 2023-09-29T12:28:06.39
IV.MOMA.HHE. ML:1.8 0.00013625655000000002 0.2368 AML other m 2023-09-29T12:28:03.87
IV.MOMA.HHN. ML:1.7 0.0001256767 0.32 AML other m 2023-09-29T12:28:09.12
IV.TOLF.HHE. ML:0.0 0.00034271835 0.16 AML other m 2023-09-29T12:28:10.18
IV.TOLF.HHN. ML:0.0 0.00025771449999999993 0.1792 AML other m 2023-09-29T12:28:10.13
IV.CAFI.HHN. ML:1.4 0.00004239805 0.224 AML other m 2023-09-29T12:28:10.86
IV.ATMI.HHN. ML:2.4 0.00034503720000000004 0.3584 AML other m 2023-09-29T12:28:12.35
IV.CAFI.HHE. ML:1.5 0.000045496305 0.2048 AML other m 2023-09-29T12:28:09.41
IV.ATMI.HHE. ML:2.2 0.0002162409 0.2624 AML other m 2023-09-29T12:28:11.02
IV.ARCI.HNE. ML:1.4 0.00008433810499999999 0.2368 AML other m 2023-09-29T12:28:01.16
IV.MOMA.HNE. ML:1.8 0.0001493184 0.2176 AML other m 2023-09-29T12:28:03.87
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