Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 30-01-2018 and time 09:56:17 (Italy) in region 2 km SW Roccastrada (GR)

A magnitude ML 0.8 earthquake occured in region: 2 km SW Roccastrada (GR), on

  • 30-01-2018 08:56:17 (UTC)
  • 30-01-2018 09:56:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 42.9960, 11.1550 at 10 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 2 9199 9199
Civitella Paganico GR 10 3154 12353
Campagnatico GR 16 2412 14765
Monticiano SI 16 1571 16336
Chiusdino SI 19 1903 18239
Montieri GR 19 1204 19443

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km N of Grosseto (82087 inhabitants)
39 Km SW of Siena (53903 inhabitants)
79 Km SW of Arezzo (99543 inhabitants)
85 Km S of Scandicci (50609 inhabitants)
87 Km S of Firenze (382808 inhabitants)
92 Km SE of Livorno (159219 inhabitants)
99 Km S of Prato (191150 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 0.8 2018-01-30
08:56:17		 42.9957 11.1547 10 2019-04-24
14:49:37		 Bollettino Sismico Italiano INGV 58402111
Reviewed
Rev100 		ML 1.0 2018-01-30
08:56:17		 42.996 11.1517 10 2018-01-30
09:08:42		 Sala Sismica INGV-Roma 53549531
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-01-30 08:56:17 ± 0.09
Latitude 42.9957 ± 0.0072
Longitude 11.1547 ± 0.0098
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 58402111

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 855
Semi-minor axis of confidence ellipse (meter) 728
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 309
Circular confidence region, given by single value of horizontal uncertainty (meter) 850.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.26
Epicentral distance of station closest to the epicenter (degree) 0.09173
Epicentral distance of station farthest from the epicenter (degree) 0.56747
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 9
Magnitudes information

ML:1.0

Field Value
Value 1.0
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 53549531
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-01-30 09:08:42

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 58402111
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2018-07-07 23:56:08
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
TV.SF14.HHN. 2018-01-30T08:56:32.03 0.3 undecidable manual S 125 45.9207 50 -0.72 58
TV.SF13.HHN. 2018-01-30T08:56:31.60 0.3 undecidable manual S 117 42.624 50 -0.25 68
IV.MAON.HHZ. 2018-01-30T08:56:30.06 3.0 undecidable manual P 62.9925 1.05 0
IV.CASP.HHZ. 2018-01-30T08:56:29.19 0.6 undecidable manual S 226 32.745 50 -0.03 48
IV.ARCI.HHZ. 2018-01-30T08:56:28.41 0.3 undecidable manual S 121 30.5472 50 -0.23 69
TV.SF11.HHZ. 2018-01-30T08:56:26.59 1.0 undecidable manual P 108 44.8218 50 0.37 22
IV.FROS.HHZ. 2018-01-30T08:56:26.46 0.6 undecidable manual S 0 23.754 112 -0.11 48
IV.TRIF.HHZ. 2018-01-30T08:56:26.41 0.6 undecidable manual S 303 24.3534 111 -0.35 46
TV.SF04.EHZ. 2018-01-30T08:56:26.34 1.0 undecidable manual P 113 44.7219 50 0.14 23
TV.SF13.HHN. 2018-01-30T08:56:26.40 0.3 undecidable manual P 117 42.624 50 0.53 63
TV.SF14.HHN. 2018-01-30T08:56:26.51 0.1 undecidable manual P 125 45.9207 50 0.13 92
IV.ARCI.HHZ. 2018-01-30T08:56:24.40 0.1 undecidable manual P 121 30.5472 50 0.39 89
IV.CASP.HHZ. 2018-01-30T08:56:24.73 1.0 undecidable manual P 226 32.745 50 0.38 22
IV.TRIF.HHZ. 2018-01-30T08:56:23.02 0.6 undecidable manual P 303 24.3534 111 0.09 48
IV.FROS.HHZ. 2018-01-30T08:56:22.82 0.3 undecidable manual P 0 23.754 112 0 74
IV.RIBO.EHZ.01 2018-01-30T08:56:22.43 0.6 undecidable manual S 240 10.1787 133 -0.11 49
IV.RIBO.EHZ.01 2018-01-30T08:56:20.47 0.1 undecidable manual P 240 10.1787 133 -0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CASP.HHE. ML:0.0 0.000017141669999999997 0.2752 AML other m 2018-01-30T08:56:31.49
IV.CASP.HHN. ML:0.0 0.000019494855 1.12 AML other m 2018-01-30T08:56:29.79
IV.RIBO.EHE.01 ML:1.4 0.00033416909999999997 0.6976 AML other m 2018-01-30T08:56:23.32
IV.FROS.HHE. ML:0.9 0.00004822664999999999 1.9648 AML other m 2018-01-30T08:56:26.88
IV.FROS.HHN. ML:0.9 0.000050854195000000005 0.3072 AML other m 2018-01-30T08:56:27.91
IV.TRIF.HHN. ML:0.8 0.000035399754999999996 0.2752 AML other m 2018-01-30T08:56:27.52
IV.TRIF.HHE. ML:0.8 0.00003831916 1.6 AML other m 2018-01-30T08:56:26.77
IV.ARCI.HHE. ML:0.8 0.000029477200000000003 0.1408 AML other m 2018-01-30T08:56:29.07
IV.ARCI.HHN. ML:0.9 0.000039006595 0.1984 AML other m 2018-01-30T08:56:28.65
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