Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.0 on date 18-09-2012 and time 08:08:35 (Italy) in region 2 km W Bolsena (VT)

A magnitude ML 2.0 earthquake occured in region: 2 km W Bolsena (VT), on

  • 18-09-2012 06:08:35 (UTC)
  • 18-09-2012 08:08:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.6460, 11.9610 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
Bolsena VT 2 3991 3991
San Lorenzo Nuovo VT 6 2091 6082
Castel Giorgio TR 7 2131 8213
Grotte di Castro VT 8 2683 10896
Gradoli VT 9 1353 12249
Latera VT 11 836 13085
Bagnoregio VT 12 3650 16735
Capodimonte VT 12 1731 18466
Lubriano VT 12 909 19375
Marta VT 13 3499 22874
Porano TR 13 1966 24840
Castel Viscardo TR 13 2938 27778
Onano VT 13 995 28773
Montefiascone VT 13 13432 42205
Acquapendente VT 14 5506 47711
Valentano VT 14 2868 50579
Orvieto TR 15 20630 71209
Proceno VT 16 557 71766
Celleno VT 17 1355 73121
Piansano VT 18 2079 75200
Allerona TR 19 1794 76994
Civitella d'Agliano VT 19 1640 78634
Castiglione in Teverina VT 20 2329 80963
Ischia di Castro VT 20 2326 83289

Municipalities with at least 50000 inhabitants

An earthquake occurred to
28 Km NW of Viterbo (67173 inhabitants)
57 Km W of Terni (111501 inhabitants)
62 Km SW of Perugia (166134 inhabitants)
63 Km N of Civitavecchia (52991 inhabitants)
70 Km SW of Foligno (57155 inhabitants)
70 Km E of Grosseto (82087 inhabitants)
91 Km SE of Siena (53903 inhabitants)
92 Km S of Arezzo (99543 inhabitants)
94 Km NW of Roma (2864731 inhabitants)
95 Km NW of Guidonia Montecelio (88673 inhabitants)
100 Km N of Fiumicino (78395 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 1.9 2012-09-18
06:08:34		 42.6145 11.9393 20 2014-10-21
12:08:56		 Sala Sismica INGV-Roma 2190561
Bulletin
Rev1000 		ML 2.0 2012-09-18
06:08:35		 42.6458 11.961 11 2014-09-19
08:14:18		 Bollettino Sismico Italiano INGV 2645521
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2012-09-18 06:08:35 ± 0.13
Latitude 42.6458 ± 0.0072
Longitude 11.9610 ± 0.0073
Depth (km) 11 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 2645521

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 741
Semi-minor axis of confidence ellipse (meter) 570
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 15
Circular confidence region, given by single value of horizontal uncertainty (meter) 740.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 155
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.41
Epicentral distance of station closest to the epicenter (degree) 0.11961
Epicentral distance of station farthest from the epicenter (degree) 1.02253
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 14
Magnitudes information

ML:2.0

Field Value
Value 2.0
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 2645521
Agency INGV
Autore Manually reviewed by Franco Mele
Time of creation (UTC) 2014-09-18 12:41:59

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 20
Type of magnitude ML
Reference to an origin 2190561
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2012-09-18 07:07:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ATMC.EHZ. 2012-09-18T06:09:02.51 0.3 undecidable manual S 12 90.8424 50 0.68 56
IV.ATVO.HHZ. 2012-09-18T06:09:01.60 0.6 undecidable manual S 24 89.3439 50 0.17 43
IV.MURB.HHZ. 2012-09-18T06:09:00.29 0.3 undecidable manual S 34 82.3509 50 0.72 56
IV.ATVA.EHZ. 2012-09-18T06:08:57.68 0.6 undecidable manual S 20 74.9694 50 0.08 45
IV.CAFI.HHZ. 2012-09-18T06:08:57.66 0.3 undecidable manual S 0 75.7686 50 -0.17 67
IV.ATTE.HHZ. 2012-09-18T06:08:56.55 0.3 undecidable manual S 27 69.0753 50 0.53 62
IV.PARC.HHZ. 2012-09-18T06:08:53.98 0.3 undecidable manual P 11 113.4975 50 -0.04 64
IV.ATPC.HHZ. 2012-09-18T06:08:51.96 0.1 undecidable manual P 23 100.9212 50 -0.13 85
IV.ATMC.EHZ. 2012-09-18T06:08:50.68 0.3 undecidable manual P 12 90.8424 50 0.15 65
IV.CESX.HHZ. 2012-09-18T06:08:50.39 0.6 undecidable manual S 94 51.2154 50 -0.88 39
IV.MURB.HHZ. 2012-09-18T06:08:49.00 0.3 undecidable manual P 34 82.3509 50 -0.22 65
IV.ATVO.HHZ. 2012-09-18T06:08:49.55 0.3 undecidable manual P 24 89.3439 50 -0.75 55
IV.ARCI.HHZ. 2012-09-18T06:08:49.23 0.3 undecidable manual S 300 45.7209 50 -0.56 65
IV.MAON.HHZ. 2012-09-18T06:08:48.76 0.3 undecidable manual P 251 71.9724 50 1.13 46
IV.ATVA.EHZ. 2012-09-18T06:08:47.47 0.1 undecidable manual P 20 74.9694 50 -0.62 80
IV.CAFI.HHZ. 2012-09-18T06:08:47.57 0.1 undecidable manual P 0 75.7686 50 -0.64 79
IV.ARRO.EHZ. 2012-09-18T06:08:46.72 0.6 undecidable manual P 96 66.0894 50 0 46
IV.ATTE.HHZ. 2012-09-18T06:08:46.71 0.1 undecidable manual P 27 69.0753 50 -0.46 85
IV.CESX.HHZ. 2012-09-18T06:08:45.23 0.6 undecidable manual P 94 51.2154 50 0.8 37
IV.MCIV.HHZ. 2012-09-18T06:08:44.67 0.3 undecidable manual S 302 27.4503 50 -0.25 72
IV.ARCI.HHZ. 2012-09-18T06:08:43.35 0.3 undecidable manual P 300 45.7209 50 -0.22 70
IV.LATE.HHZ. 2012-09-18T06:08:41.23 0.3 undecidable manual S 254 13.2756 129 0.18 75
IV.MCIV.HHZ. 2012-09-18T06:08:40.47 0.1 undecidable manual P 302 27.4503 50 -0.3 95
IV.LATE.HHZ. 2012-09-18T06:08:38.68 0.1 undecidable manual P 254 13.2756 129 0.15 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARCI.HHE. ML:1.6 0.000129 0.24 AML other m 2012-09-18T06:08:52.01
IV.ARCI.HHN. ML:1.7 0.000152 0.5 AML other m 2012-09-18T06:08:52.66
IV.ATPC.HHN. ML:1.8 0.000067 0.42 AML other m 2012-09-18T06:09:07.86
IV.ATPC.HHE. ML:2.0 0.0000959 0.58 AML other m 2012-09-18T06:09:10.91
IV.ATTE.HHN. ML:1.9 0.00014350000000000002 0.26 AML other m 2012-09-18T06:08:56.65
IV.ATTE.HHE. ML:1.9 0.000135 0.94 AML other m 2012-09-18T06:08:59.49
IV.ATVO.HHN. ML:1.6 0.00005215 0.44 AML other m 2012-09-18T06:09:04.59
IV.ATVO.HHE. ML:1.9 0.00008645 1.42 AML other m 2012-09-18T06:09:06.97
IV.CAFI.HNE. ML:1.9 0.00011831000000000001 1 AML other m 2012-09-18T06:08:58.33
IV.CAFI.HHN. ML:1.8 0.00010485 0.28 AML other m 2012-09-18T06:08:58.47
IV.CAFI.HHE. ML:1.9 0.00011649999999999999 0.86 AML other m 2012-09-18T06:08:58.32
IV.CAFI.HNN. ML:2.5 0.00045434999999999996 1.58 AML other m 2012-09-18T06:08:47.15
IV.CASP.HHE. ML:1.5 0.000038599999999999996 0.48 AML other m 2012-09-18T06:09:05.92
IV.CASP.HHN. ML:2.0 0.00010489999999999999 0.42 AML other m 2012-09-18T06:09:06.11
IV.LATE.HHN. ML:2.5 0.00294 0.62 AML other m 2012-09-18T06:08:43.31
IV.LATE.HHE. ML:2.5 0.00302 0.22 AML other m 2012-09-18T06:08:44.09
IV.MCIV.HHE. ML:1.9 0.0004360000000000001 0.46 AML other m 2012-09-18T06:08:44.93
IV.MCIV.HHN. ML:2.1 0.0007190000000000001 0.24 AML other m 2012-09-18T06:08:45.73
IV.MGAB.HHE. ML:2.2 0.0006525 1.02 AML other m 2012-09-18T06:08:47.16
IV.MGAB.HNE. ML:2.1 0.0006115000000000001 0.18 AML other m 2012-09-18T06:08:47.16
IV.MGAB.HHN. ML:2.2 0.0006425 0.16 AML other m 2012-09-18T06:08:46.35
IV.MGAB.HNN. ML:2.1 0.0006115 0.16 AML other m 2012-09-18T06:08:46.43
IV.PARC.HHE. ML:1.8 0.000050350000000000004 1.06 AML other m 2012-09-18T06:09:10.65
IV.PARC.HHN. ML:1.9 0.000058649999999999996 0.76 AML other m 2012-09-18T06:09:12.11
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