INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.8 on date 10-10-2018 and time 00:39:20 (Italy) in region 6 km N Proceno (VT)

A magnitude ML 1.8 earthquake occured in region: 6 km N Proceno (VT), on

  • 09-10-2018 22:39:20 (UTC)
  • 10-10-2018 00:39:20 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.81, 11.82 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Proceno VT 6 557 557
Acquapendente VT 8 5506 6063
San Casciano dei Bagni SI 8 1632 7695
Radicofani SI 11 1097 8792
Castell'Azzara GR 11 1476 10268
Piancastagnaio SI 11 4230 14498
Allerona TR 13 1794 16292
Onano VT 13 995 17287
Abbadia San Salvatore SI 14 6444 23731
San Lorenzo Nuovo VT 16 2091 25822
Grotte di Castro VT 16 2683 28505
Castel Viscardo TR 16 2938 31443
Fabro TR 17 2876 34319
Sorano GR 17 3428 37747
Castel Giorgio TR 17 2131 39878
Cetona SI 18 2755 42633
Gradoli VT 19 1353 43986
Santa Fiora GR 19 2622 46608

Municipalities with at least 50000 inhabitants

An earthquake occurred to
49 Km NW of Viterbo (67173 inhabitants)
57 Km SW of Perugia (166134 inhabitants)
58 Km E of Grosseto (82087 inhabitants)
69 Km SE of Siena (53903 inhabitants)
73 Km W of Terni (111501 inhabitants)
73 Km S of Arezzo (99543 inhabitants)
74 Km W of Foligno (57155 inhabitants)
80 Km N of Civitavecchia (52991 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 100 ML 1.8 2018-10-09
22:39:20
42.81 11.82 7 2018-10-09
22:47:26
Sala Sismica INGV-Roma 61782751
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-10-09 22:39:20 ± 0.07
Latitude 42.81 ± 0.01
Longitude 11.82 ± 0.00
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 61782751

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 650
Semi-minor axis of confidence ellipse (meter) 226
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 344
Circular confidence region, given by single value of horizontal uncertainty (meter) 650
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 74
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.24
Epicentral distance of station closest to the epicenter (degree) 0.07464
Epicentral distance of station farthest from the epicenter (degree) 0.70237
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.3
Num. used stations 28
Type of magnitude ML
Reference to an origin 61782751
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-10-09 22:47:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.ATMI.HHZ. 2018-10-09T22:39:42.48 0.3 undecidable manual S 32 0.616 50 -0.06 67
IV.CASP.HHZ. 2018-10-09T22:39:35.20 0.3 negative manual P 269 0.7024 50 0.36 61
IV.ATMI.HHZ. 2018-10-09T22:39:33.60 0.6 negative manual P 32 0.616 50 0.23 43
IV.MAON.HHZ. 2018-10-09T22:39:33.73 0.6 positive manual P 233 0.6358 50 0.01 45
IV.RIBO.EHZ.01 2018-10-09T22:39:33.13 1.0 negative manual P 284 0.5846 50 0.3 21
IV.CESX.HHZ. 2018-10-09T22:39:33.38 0.6 undecidable manual P 110 0.5971 50 0.34 42
IV.MOMA.HHZ. 2018-10-09T22:39:31.93 0.6 negative manual P 90 0.5486 50 -0.29 43
IV.CAFI.HHZ. 2018-10-09T22:39:31.44 0.6 negative manual P 11 0.5288 50 -0.44 42
IV.MGAB.HHZ. 2018-10-09T22:39:30.32 0.1 undecidable manual S 64 0.2356 104 0.11 95
IV.ARCI.HHZ. 2018-10-09T22:39:30.59 0.1 undecidable manual S 279 0.2572 103 -0.44 88
TV.SF01.EHZ. 2018-10-09T22:39:28.38 0.1 undecidable manual S 270 0.1898 108 -0.14 95
TV.SF13.HHZ. 2018-10-09T22:39:27.00 0.1 undecidable manual S 273 0.1484 112 -0.03 98
IV.ARCI.HHZ. 2018-10-09T22:39:26.71 0.1 positive manual P 279 0.2572 103 -0.02 96
TV.SF11.HHN. 2018-10-09T22:39:26.03 0.1 undecidable manual S 299 0.1196 117 0.02 99
TV.SF04.EHZ. 2018-10-09T22:39:26.22 0.1 undecidable manual S 282 0.1214 116 0.16 96
TV.SF14.HHN. 2018-10-09T22:39:26.95 0.1 undecidable manual S 250 0.1619 110 -0.56 87
IV.MGAB.HHZ. 2018-10-09T22:39:25.75 0.1 positive manual P 64 0.2356 104 -0.51 87
TV.SF01.EHZ. 2018-10-09T22:39:25.44 0.3 positive manual P 270 0.1898 108 0.16 71
TV.SF03.EHE. 2018-10-09T22:39:25.58 0.1 undecidable manual S 265 0.1007 121 0.22 95
IV.MCIV.HHZ. 2018-10-09T22:39:25.74 0.1 undecidable manual S 253 0.1115 118 0.01 99
IV.LATE.HHZ. 2018-10-09T22:39:25.59 0.3 positive manual P 184 0.1979 107 0.15 71
TV.SF13.HHZ. 2018-10-09T22:39:24.62 0.1 undecidable manual P 273 0.1484 112 0.2 95
TV.SF14.HHN. 2018-10-09T22:39:24.35 0.1 undecidable manual P 250 0.1619 110 -0.34 92
TV.SF11.HHN. 2018-10-09T22:39:24.11 0.1 undecidable manual P 299 0.1196 117 0.28 94
TV.SF04.EHZ. 2018-10-09T22:39:24.09 0.6 positive manual P 282 0.1214 116 0.24 47
TV.SF03.EHE. 2018-10-09T22:39:23.68 0.1 undecidable manual P 265 0.1007 121 0.22 95
IV.MCIV.HHZ. 2018-10-09T22:39:23.88 0.1 positive manual P 253 0.1115 118 0.21 95
IV.SACS.HHZ. 2018-10-09T22:39:22.98 0.1 undecidable manual P 59 0.0746 129 -0.01 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SACS.HHE. ML:2 0.001795 0.2 AML other m 2018-10-09T22:39:25.17
IV.SACS.HNE. ML:2 0.001795 0.2 AML other m 2018-10-09T22:39:25.17
IV.SACS.HHN. ML:1.9 0.00142 0.42 AML other m 2018-10-09T22:39:25.61
IV.SACS.HNN. ML:1.9 0.001395 0.26 AML other m 2018-10-09T22:39:25.61
IV.MCIV.HHE. ML:1.9 0.0010825 0.34 AML other m 2018-10-09T22:39:26.42
TV.SF04.EHE. ML:2.2 0.00202 0.16 AML other m 2018-10-09T22:39:26.84
IV.MCIV.HHN. ML:1.8 0.000868 1.28 AML other m 2018-10-09T22:39:26.22
TV.SF04.EHN. ML:2 0.00129 0.26 AML other m 2018-10-09T22:39:27.38
TV.SF01.EHE. ML:2 0.000751 0.3 AML other m 2018-10-09T22:39:29.15
TV.SF01.EHN. ML:2 0.0007875 1.7 AML other m 2018-10-09T22:39:30.85
IV.MGAB.HNN. ML:1.8 0.000391 0.12 AML other m 2018-10-09T22:39:31.13
IV.MGAB.HHN. ML:1.8 0.000378 0.12 AML other m 2018-10-09T22:39:31.20
IV.MGAB.HNE. ML:1.8 0.000347 0.14 AML other m 2018-10-09T22:39:31.29
IV.MGAB.HHE. ML:1.8 0.000373 0.5 AML other m 2018-10-09T22:39:31.29
IV.ARCI.HHE. ML:1.5 0.000166 0.24 AML other m 2018-10-09T22:39:32.28
IV.ARCI.HHN. ML:1.4 0.000129 1.58 AML other m 2018-10-09T22:39:32.08
IV.LATE.HHN. ML:2 0.000752 0.46 AML other m 2018-10-09T22:39:34.76
IV.LATE.HHE. ML:1.9 0.000605 0.4 AML other m 2018-10-09T22:39:34.77
IV.CAFI.HHE. ML:1.4 4.8E-5 0.6 AML other m 2018-10-09T22:39:40.65
IV.CAFI.HHN. ML:1.2 3.565E-5 1.08 AML other m 2018-10-09T22:39:41.17
IV.MOMA.HHN. ML:1.8 0.000113 0.82 AML other m 2018-10-09T22:39:42.57
IV.MOMA.HHE. ML:1.7 0.00010605 0.38 AML other m 2018-10-09T22:39:42.98
IV.ATMI.HHN. ML:1.9 0.000146 1.46 AML other m 2018-10-09T22:39:44.86
IV.CESX.HHE. ML:1.4 4.57E-5 1.62 AML other m 2018-10-09T22:39:44.05
IV.MAON.HHE. ML:1.3 3.35E-5 0.42 AML other m 2018-10-09T22:39:45.44
IV.MAON.HHN. ML:1.3 2.865E-5 0.5 AML other m 2018-10-09T22:39:45.52
IV.CESX.HHN. ML:1.4 4.325E-5 1.5 AML other m 2018-10-09T22:39:45.80
IV.ATMI.HHE. ML:1.9 0.0001395 1.22 AML other m 2018-10-09T22:39:48.61
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download