Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 04-03-2018 and time 19:15:46 (Italy) in region 5 km W Castel del Piano (GR)

A magnitude ML 1.6 earthquake occured in region: 5 km W Castel del Piano (GR), on

  • 04-03-2018 18:15:46 (UTC)
  • 04-03-2018 19:15:46 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.8960, 11.4770 at 5 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
Castel del Piano GR 5 4690 4690
Arcidosso GR 6 4285 8975
Cinigiano GR 7 2618 11593
Seggiano GR 8 961 12554
Santa Fiora GR 11 2622 15176
Roccalbegna GR 13 1044 16220
Campagnatico GR 16 2412 18632
Abbadia San Salvatore SI 17 6444 25076
Castiglione d'Orcia SI 17 2346 27422
Piancastagnaio SI 18 4230 31652
Montalcino SI 19 5093 36745
Semproniano GR 19 1059 37804
Civitella Paganico GR 19 3154 40958

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km E of Grosseto (82087 inhabitants)
49 Km S of Siena (53903 inhabitants)
72 Km SW of Arezzo (99543 inhabitants)
74 Km NW of Viterbo (67173 inhabitants)
78 Km W of Perugia (166134 inhabitants)
93 Km N of Civitavecchia (52991 inhabitants)
99 Km S of Firenze (382808 inhabitants)
99 Km S of Scandicci (50609 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 1.6 2018-03-04
18:15:46		 42.896 11.4768 5 2019-04-24
14:49:21		 Bollettino Sismico Italiano INGV 54740351
Reviewed
Rev100 		ML 1.6 2018-03-04
18:15:46		 42.8873 11.4762 5 2018-03-04
18:22:14		 Sala Sismica INGV-Roma 54323011
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-03-04 18:15:46 ± 0.08
Latitude 42.8960 ± 0.0072
Longitude 11.4768 ± 0.0061
Depth (km) 5 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 54740351

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 716
Semi-minor axis of confidence ellipse (meter) 497
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 177
Circular confidence region, given by single value of horizontal uncertainty (meter) 720.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 111
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.22
Epicentral distance of station closest to the epicenter (degree) 0.04407
Epicentral distance of station farthest from the epicenter (degree) 0.59265
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 54323011
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-03-04 18:22:14

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 4
Type of magnitude ML
Reference to an origin 54740351
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-02-26 08:30:33
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CASP.HHZ. 2018-03-04T18:16:03.87 0.6 undecidable manual S 257 51.1155 50 -0.38 43
IV.SACS.HHZ. 2018-03-04T18:15:59.23 0.3 undecidable manual S 98 35.5422 98 -0.05 72
IV.CSNT.HHZ. 2018-03-04T18:15:58.79 0.3 undecidable manual P 347 65.7897 50 -0.35 64
IV.CASP.HHZ. 2018-03-04T18:15:57.19 0.3 undecidable manual P 257 51.1155 50 0.31 66
IV.FROS.HHZ. 2018-03-04T18:15:55.45 0.3 undecidable manual P 323 43.4232 97 -0.12 70
IV.RIBO.EHZ.01 2018-03-04T18:15:54.29 0.3 undecidable manual P 280 35.4423 98 0.3 68
IV.SACS.HHZ. 2018-03-04T18:15:54.11 0.1 undecidable manual P 98 35.5422 98 0.1 95
TV.SF04.EHZ. 2018-03-04T18:15:52.58 0.3 undecidable manual S 114 16.3725 107 -0.18 72
TV.SF01.EHZ. 2018-03-04T18:15:51.18 0.3 undecidable manual S 143 11.6772 113 -0.05 75
TV.SF04.EHZ. 2018-03-04T18:15:50.45 0.1 undecidable manual P 114 16.3725 107 0.21 96
TV.SF01.EHZ. 2018-03-04T18:15:49.51 0.1 undecidable manual P 143 11.6772 113 0.15 98
IV.ARCI.HHZ. 2018-03-04T18:15:48.32 0.1 undecidable manual P 181 4.8951 136 0.1 100
IV.ARCI.HHZ. 2018-03-04T18:15:48.99 0.1 undecidable manual S 181 4.8951 136 -0.26 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
TV.SF01.EHE. ML:1.4 0.000381 0.18 AML other m 2018-03-04T18:15:51.83
TV.SF04.EHE. ML:1.8 0.0006979999999999999 0.28 AML other m 2018-03-04T18:15:53.67
TV.SF04.EHN. ML:1.7 0.0005235 0.12 AML other m 2018-03-04T18:15:53.90
TV.SF01.EHN. ML:1.4 0.0003355 0.66 AML other m 2018-03-04T18:15:56.08
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