Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 16-05-2018 and time 10:51:43 (Italy) in region 13 km SW Roccastrada (GR)

A magnitude ML 1.4 earthquake occured in region: 13 km SW Roccastrada (GR), on

  • 16-05-2018 08:51:43 (UTC)
  • 16-05-2018 10:51:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9110, 11.1000 at 6 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
Roccastrada GR 13 9199 9199
Campagnatico GR 15 2412 11611
Gavorrano GR 16 8580 20191
Grosseto GR 17 82087 102278
Civitella Paganico GR 18 3154 105432

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km N of Grosseto (82087 inhabitants)
49 Km SW of Siena (53903 inhabitants)
89 Km SW of Arezzo (99543 inhabitants)
95 Km S of Scandicci (50609 inhabitants)
96 Km SE of Livorno (159219 inhabitants)
96 Km S of Firenze (382808 inhabitants)
99 Km NW of Viterbo (67173 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 1.4 2018-05-16
08:51:43		 42.9112 11.1005 6 2019-04-24
14:51:09		 Bollettino Sismico Italiano INGV 66198161
Reviewed
Rev100 		ML 1.4 2018-05-16
08:51:43		 42.928 11.0977 7 2018-05-16
09:06:19		 Sala Sismica INGV-Roma 56916471
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-05-16 08:51:43 ± 0.15
Latitude 42.9112 ± 0.0099
Longitude 11.1005 ± 0.0111
Depth (km) 6 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 66198161

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 990
Semi-minor axis of confidence ellipse (meter) 840
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 210
Circular confidence region, given by single value of horizontal uncertainty (meter) 990.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.39
Epicentral distance of station closest to the epicenter (degree) 0.05486
Epicentral distance of station farthest from the epicenter (degree) 0.48294
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:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 7
Type of magnitude ML
Reference to an origin 66198161
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2019-03-05 16:45:15

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 8
Type of magnitude ML
Reference to an origin 56916471
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-05-16 09:06:19
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
TV.SF04.EHZ. 2018-05-16T08:51:58.10 0.6 undecidable manual S 100 46.3203 50 -1.12 36
TV.SF01.EHZ. 2018-05-16T08:51:56.40 0.6 undecidable manual S 106 39.2274 98 -0.5 48
IV.MCIV.HHZ. 2018-05-16T08:51:53.07 0.1 undecidable manual P 107 49.1175 50 0.2 100
IV.FROS.HHZ. 2018-05-16T08:51:53.89 0.6 undecidable manual S 8 33.4443 99 -1.03 39
IV.MAON.HHZ. 2018-05-16T08:51:53.86 0.3 undecidable manual P 177 53.6019 50 0.29 73
IV.ARCI.HHZ. 2018-05-16T08:51:53.87 0.6 undecidable manual S 102 31.1466 100 -0.28 51
TV.SF04.EHZ. 2018-05-16T08:51:52.59 0.3 undecidable manual P 100 46.3203 50 0.16 76
TV.SF01.EHZ. 2018-05-16T08:51:51.30 0.3 undecidable manual P 106 39.2274 98 0.2 76
IV.FROS.HHZ. 2018-05-16T08:51:50.29 0.1 undecidable manual P 8 33.4443 99 0.34 100
IV.ARCI.HHZ. 2018-05-16T08:51:50.08 0.3 undecidable manual P 102 31.1466 100 0.57 71
IV.CASP.HHZ. 2018-05-16T08:51:50.89 0.6 undecidable manual S 235 23.3544 103 -0.59 47
IV.CASP.HHZ. 2018-05-16T08:51:47.78 0.3 undecidable manual P 235 23.3544 103 -0.19 79
IV.RIBO.EHZ.01 2018-05-16T08:51:45.97 0.3 undecidable manual S 314 6.0939 132 -0.03 84
IV.RIBO.EHZ.01 2018-05-16T08:51:45.06 0.3 undecidable manual P 314 6.0939 132 0.26 80
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CASP.HHE. ML:1.1 0.000083627175 0.2432 AML other m 2018-05-16T08:51:51.26
IV.ARCI.HHN. ML:1.2 0.00006880195 0.2816 AML other m 2018-05-16T08:51:54.45
IV.FROS.HHE. ML:2.0 0.0003975 0.16 AML other m 2018-05-16T08:51:54.39
IV.FROS.HHN. ML:1.9 0.0003275 0.22 AML other m 2018-05-16T08:51:54.52
IV.ARCI.HHE. ML:1.3 0.00009290000000000001 1.34 AML other m 2018-05-16T08:51:55.03
TV.SF01.EHN. ML:1.1 0.000052313815 0.3008 AML other m 2018-05-16T08:51:57.67
TV.SF04.EHN. ML:1.6 0.00011132143999999999 0.2176 AML other m 2018-05-16T08:51:58.97
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