Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 27-03-2011 and time 19:59:04 (UTC) in region 2 km N Santa Fiora (GR)

A magnitude ML 1.6 earthquake occured in region: 2 km N Santa Fiora (GR), on

  • 27-03-2011 19:59:04 (UTC)
  • 27-03-2011 21:59:04 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.8540, 11.5920 at 7 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
Santa Fiora GR 2 2622 2622
Arcidosso GR 5 4285 6907
Castel del Piano GR 6 4690 11597
Abbadia San Salvatore SI 8 6444 18041
Piancastagnaio SI 8 4230 22271
Seggiano GR 9 961 23232
Roccalbegna GR 10 1044 24276
Castell'Azzara GR 12 1476 25752
Semproniano GR 14 1059 26811
Radicofani SI 15 1097 27908
Cinigiano GR 17 2618 30526
Castiglione d'Orcia SI 17 2346 32872

Municipalities with at least 50000 inhabitants

An earthquake occurred to
40 Km E of Grosseto (82087 inhabitants)
56 Km SE of Siena (53903 inhabitants)
64 Km NW of Viterbo (67173 inhabitants)
71 Km W of Perugia (166134 inhabitants)
72 Km SW of Arezzo (99543 inhabitants)
86 Km N of Civitavecchia (52991 inhabitants)
91 Km W of Foligno (57155 inhabitants)
92 Km W of Terni (111501 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 		Md 2.2
ML 1.6 		2011-03-27
19:59:04		 42.854 11.592 7 2014-10-21
12:27:13		 Bollettino Sismico Italiano INGV 1187579
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2011-03-27 19:59:04 ± 0.08
Latitude 42.8540 ± 0.0090
Longitude 11.5920 ± 0.0061
Depth (km) 7 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-SISPICK
Event type earthquake
Origin ID 1187579

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 985
Semi-minor axis of confidence ellipse (meter) 359
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 197
Circular confidence region, given by single value of horizontal uncertainty (meter) 1118.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 122
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 19
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) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.95328
Number of stations at which the event was observed 14
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations
Type of magnitude ML
Reference to an origin 1187579
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 23:11:58

Md:2.2

Field Value
Value 2.2
Uncertainty 0.2
Num. used stations
Type of magnitude Md
Reference to an origin 1187579
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-05 23:11:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.TRIF.HHZ. 2011-03-27T19:59:24.79 0.3 undecidable manual Sg 298 62.9925 -0.274 65
IV.ASQU.HHN. 2011-03-27T19:59:23.56 0.6 undecidable manual Pg 9 105.8163 0.454 38
IV.PARC.HHN. 2011-03-27T19:59:22.66 0.3 undecidable manual Pg 30 102.5196 0.058 63
IV.MURB.HHE. 2011-03-27T19:59:21.19 0.6 undecidable manual Pg 59 88.1451 0.794 35
IV.CRE.HHZ. 2011-03-27T19:59:21.06 0.3 undecidable manual Pg 19 89.7435 0.433 59
IV.ATVO.HHE. 2011-03-27T19:59:20.59 0.3 undecidable manual Pg 48 88.245 0.191 63
IV.MGAB.HHZ. 2011-03-27T19:59:18.87 0.3 undecidable manual Sg 81 42.8238 -0.804 57
IV.ATTE.HHZ. 2011-03-27T19:59:17.78 0.3 undecidable manual Pg 58 72.5718 -0.213 64
IV.LATE.HHZ. 2011-03-27T19:59:16.15 0.3 undecidable manual Sg 147 31.746 0.057 72
IV.TRIF.HHZ. 2011-03-27T19:59:16.89 0.3 undecidable manual Pg 298 62.9925 0.379 63
IV.CAFI.HHZ. 2011-03-27T19:59:15.83 0.1 undecidable manual Pg 30 60.7947 -0.351 85
IV.MGAB.HHZ. 2011-03-27T19:59:13.41 0.3 undecidable manual Pg 81 42.8238 0.008 71
IV.SACS.HHZ. 2011-03-27T19:59:13.97 0.3 undecidable manual Sg 91 25.8519 -0.125 71
IV.LATE.HHZ. 2011-03-27T19:59:11.53 0.1 undecidable manual Pg 147 31.746 0.2 93
IV.SACS.HHZ. 2011-03-27T19:59:10.27 0.1 undecidable manual Pg 91 25.8519 0.096 96
IV.MCIV.HHZ. 2011-03-27T19:59:09.12 0.3 undecidable manual Sg 140 10.7781 -0.131 73
IV.ARCI.HHZ. 2011-03-27T19:59:08.60 0.1 undecidable manual Sg 269 9.4794 -0.259 95
IV.ARCI.HHZ. 2011-03-27T19:59:07.13 0.1 undecidable manual Pg 269 9.4794 -0.024 100
IV.MCIV.HHZ. 2011-03-27T19:59:07.46 0.1 undecidable manual Pg 140 10.7781 0.081 99
IV.ORI.HHE. 2011-03-27T19:59:00.30 10.0 undecidable manual Pg 0 0 0
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download