Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 2.2 on date 31-05-2016 and time 14:43:47 (Italy) in region 1 km SE Acquapendente (VT)

A magnitude ML 2.2 earthquake occured in region: 1 km SE Acquapendente (VT), on

  • 31-05-2016 12:43:47 (UTC)
  • 31-05-2016 14:43:47 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7360, 11.8780 at 8 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
Acquapendente VT 1 5506 5506
Proceno VT 5 557 6063
San Lorenzo Nuovo VT 6 2091 8154
Onano VT 7 995 9149
Grotte di Castro VT 7 2683 11832
Castel Giorgio TR 9 2131 13963
Gradoli VT 10 1353 15316
Castel Viscardo TR 10 2938 18254
Allerona TR 12 1794 20048
Latera VT 13 836 20884
Bolsena VT 14 3991 24875
Sorano GR 15 3428 28303
San Casciano dei Bagni SI 15 1632 29935
Castell'Azzara GR 15 1476 31411
Fabro TR 18 2876 34287
Valentano VT 19 2868 37155
Orvieto TR 19 20630 57785
Porano TR 19 1966 59751
Ficulle TR 19 1669 61420
Piancastagnaio SI 20 4230 65650

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km NW of Viterbo (67173 inhabitants)
59 Km SW of Perugia (166134 inhabitants)
62 Km E of Grosseto (82087 inhabitants)
66 Km W of Terni (111501 inhabitants)
72 Km W of Foligno (57155 inhabitants)
72 Km N of Civitavecchia (52991 inhabitants)
79 Km SE of Siena (53903 inhabitants)
81 Km S of Arezzo (99543 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
Bulletin
Rev1000 		ML 2.2 2016-05-31
12:43:47		 42.7358 11.8782 8 2016-11-08
11:48:48		 Bollettino Sismico Italiano INGV 25725011
Reviewed
Rev100 		ML 2.2 2016-05-31
12:43:47		 42.7353 11.8672 8 2016-05-31
12:52:10		 Sala Sismica INGV-Roma 25480101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2016-05-31 12:43:47 ± 0.09
Latitude 42.7358 ± 0.0054
Longitude 11.8782 ± 0.0086
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 25725011

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 731
Semi-minor axis of confidence ellipse (meter) 392
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 305
Circular confidence region, given by single value of horizontal uncertainty (meter) 730.0
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 25
Number of defining phases 25
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.29
Epicentral distance of station closest to the epicenter (degree) 0.11511
Epicentral distance of station farthest from the epicenter (degree) 0.94968
Number of stations at which the event was observed 18
Number of stations from which data was used for origin computation 18
Magnitudes information

ML:2.2

Field Value
Value 2.2
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 25725011
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2016-09-14 13:34:09

ML:2.2

Field Value
Value 2.2
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 25480101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2016-05-31 12:52:10
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ATVA.EHE. 2016-05-31T12:44:09.30 0.6 undecidable manual S 29 68.6757 50 0.19 45
IV.ATTE.HHN. 2016-05-31T12:44:08.15 0.6 undecidable manual S 37 64.1913 50 0.24 45
IV.CAFI.HHZ. 2016-05-31T12:44:08.70 0.6 undecidable manual S 6 66.1893 50 0.25 44
IV.PARC.HHZ. 2016-05-31T12:44:06.27 0.1 undecidable manual P 16 105.4167 50 0.61 74
IV.CASP.HHE. 2016-05-31T12:44:02.74 0.6 undecidable manual P 275 82.7505 50 0.57 40
IV.MURB.HHE. 2016-05-31T12:44:01.71 0.3 undecidable manual P 42 78.5658 50 0.19 66
IV.ATMI.HHZ. 2016-05-31T12:44:01.19 0.6 undecidable manual P 25 73.5708 50 0.44 42
IV.ATLO.EHE. 2016-05-31T12:44:01.22 0.3 undecidable manual P 34 77.2671 50 -0.11 67
IV.ATCC.EHE. 2016-05-31T12:44:01.58 0.3 undecidable manual P 51 79.4649 50 -0.08 67
IV.MAON.HHZ. 2016-05-31T12:44:00.59 0.3 undecidable manual P 241 69.8745 50 0.4 64
IV.ASSB.HHN. 2016-05-31T12:44:00.26 0.3 undecidable manual P 62 71.9724 50 -0.25 66
IV.TOLF.HHZ. 2016-05-31T12:44:00.44 0.3 undecidable manual P 172 75.1692 50 -0.56 60
IV.CAFI.HHZ. 2016-05-31T12:43:59.31 0.1 undecidable manual P 6 66.1893 50 -0.31 87
IV.ATVA.EHE. 2016-05-31T12:43:59.53 0.1 undecidable manual P 29 68.6757 50 -0.47 84
IV.ATTE.HHN. 2016-05-31T12:43:59.26 0.3 undecidable manual P 37 64.1913 50 -0.05 70
IV.CESX.HHE. 2016-05-31T12:43:58.49 0.6 undecidable manual P 103 59.496 50 -0.1 46
IV.MGAB.HHZ. 2016-05-31T12:43:57.59 0.3 undecidable manual S 44 27.3504 106 0.18 72
IV.ARCI.HHZ. 2016-05-31T12:43:54.32 0.1 negative manual P 292 35.2425 102 -0.46 89
IV.MCIV.HHZ. 2016-05-31T12:43:53.83 0.3 undecidable manual S 286 17.0718 114 -0.23 73
IV.LATE.HHZ. 2016-05-31T12:43:53.96 0.6 undecidable manual S 204 14.874 117 0.61 44
IV.MGAB.HHZ. 2016-05-31T12:43:52.87 0.1 positive manual P 44 27.3504 106 -0.38 92
IV.SACS.HHZ. 2016-05-31T12:43:52.97 0.3 undecidable manual S 12 12.7761 121 0.22 73
IV.LATE.HHZ. 2016-05-31T12:43:51.02 0.1 positive manual P 204 14.874 117 0.11 100
IV.MCIV.HHZ. 2016-05-31T12:43:51.33 0.3 undecidable manual P 286 17.0718 114 0.01 76
IV.SACS.HHZ. 2016-05-31T12:43:50.68 0.1 positive manual P 12 12.7761 121 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARCI.HHE. ML:2.2 0.0006129999999999999 0.34 AML other m 2016-05-31T12:44:01.18
IV.ARCI.HHN. ML:2.0 0.000433 0.44 AML other m 2016-05-31T12:44:02.51
IV.MCIV.HHE. ML:2.4 0.0021849999999999994 0.92 AML other m 2016-05-31T12:43:54.44
IV.MCIV.HHN. ML:2.2 0.001425 0.56 AML other m 2016-05-31T12:43:58.66
IV.SACS.HNE. ML:2.2 0.0021000000000000003 0.26 AML other m 2016-05-31T12:43:53.77
IV.SACS.HHE. ML:2.2 0.0020499999999999997 0.26 AML other m 2016-05-31T12:43:53.90
IV.SACS.HNN. ML:2.3 0.0026 0.76 AML other m 2016-05-31T12:43:54.17
IV.SACS.HHN. ML:2.4 0.002685 0.76 AML other m 2016-05-31T12:43:54.17
IV.TOLF.HHE. ML:2.2 0.000243 1.4 AML other m 2016-05-31T12:44:13.74
IV.TOLF.HHN. ML:2.1 0.000177 0.76 AML other m 2016-05-31T12:44:13.63
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