Earthquake with magnitude of ML 0.9 on date 23-10-2018 and time 20:52:29 (Italy) in region 3 km E Castelfiorentino (FI)

A magnitude ML 0.9 earthquake occured in region: 3 km E Castelfiorentino (FI), on

  • 23-10-2018 18:52:29 (UTC)
  • 23-10-2018 20:52:29 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.62, 11.01 at 10 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Castelfiorentino FI 3 17504 17504
Montespertoli FI 6 13537 31041
Certaldo FI 8 16121 47162
Gambassi Terme FI 10 4870 52032
Montaione FI 11 3700 55732
Empoli FI 12 48109 103841
Montelupo Fiorentino FI 13 14098 117939
San Miniato PI 14 27934 145873
Capraia e Limite FI 14 7670 153543
Tavarnelle Val di Pesa FI 15 7800 161343
San Casciano in Val di Pesa FI 15 17062 178405
Barberino Val d'Elsa FI 16 4386 182791
San Gimignano SI 17 7820 190611
Cerreto Guidi FI 19 10870 201481
Palaia PI 19 4612 206093
Lastra a Signa FI 19 20156 226249
Signa FI 20 19179 245428
Vinci FI 20 14604 260032

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km SW of Scandicci (50609 inhabitants)
26 Km SW of Firenze (382808 inhabitants)
30 Km S of Prato (191150 inhabitants)
36 Km S of Pistoia (90315 inhabitants)
43 Km NW of Siena (53903 inhabitants)
48 Km SE of Lucca (89046 inhabitants)
50 Km E of Pisa (89158 inhabitants)
57 Km E of Livorno (159219 inhabitants)
67 Km E of Viareggio (62467 inhabitants)
73 Km W of Arezzo (99543 inhabitants)
84 Km SE of Massa (69479 inhabitants)
89 Km SE of Carrara (63133 inhabitants)
96 Km N of Grosseto (82087 inhabitants)
100 Km SW of Imola (69797 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 100 ML 0.9 2018-10-23
18:52:29
43.62 11.01 10 2018-10-23
19:05:11
Sala Sismica INGV-Roma 62255981
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-10-23 18:52:29 ± 0.2
Latitude 43.62 ± 0.01
Longitude 11.01 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 62255981

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1019
Semi-minor axis of confidence ellipse (meter) 864
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 274
Circular confidence region, given by single value of horizontal uncertainty (meter) 1020
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 115
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.3
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.5333
Number of stations at which the event was observed 19
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.1
Num. used stations 2
Type of magnitude ML
Reference to an origin 62255981
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-10-23 19:05:11
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.LRP.EHZ. 2018-10-23T18:53:56.42 3.0 undecidable manual Sg 2.86 0
IV.CDRU.HHZ. 2018-10-23T18:53:45.87 3.0 undecidable manual Pg 4.21 0
IV.EUCT.HNZ. 2018-10-23T18:53:39.82 3.0 undecidable manual Sg 4.58 0
IV.VIVA.HHZ. 2018-10-23T18:53:37.96 3.0 undecidable manual Sg -4.44 0
IV.FIAM.HHZ. 2018-10-23T18:53:36.54 3.0 undecidable manual Sg -0.2 0
IV.PAOL.HHZ. 2018-10-23T18:53:34.77 3.0 undecidable manual Pg 3.8 0
GU.SATI.HHZ. 2018-10-23T18:53:24.88 3.0 undecidable manual Pg 2.15 0
IV.FIAM.HHZ. 2018-10-23T18:53:03.56 3.0 negative manual Pn -4.85 0
IV.IMOL.HNZ. 2018-10-23T18:53:03.70 3.0 undecidable manual S -0.55 0
IV.NDIM.HHZ. 2018-10-23T18:52:56.60 3.0 negative manual P 0.32 0
IV.PIEI.HHZ. 2018-10-23T18:52:52.56 3.0 positive manual P -2.36 0
IV.TRIF.HHE. 2018-10-23T18:52:47.22 0.6 undecidable manual S 189 0.509 50 -0.44 46
IV.MAGO.HHN. 2018-10-23T18:52:45.75 0.6 undecidable manual S 216 0.4281 50 0.5 46
IV.PII.HHZ. 2018-10-23T18:52:42.45 0.6 undecidable manual S 287 0.3633 50 -0.87 40
IV.BDI.HHZ. 2018-10-23T18:52:41.00 0.6 undecidable manual P 326 0.5333 50 0.45 46
GU.POPM.HHZ. 2018-10-23T18:52:39.58 1.0 undecidable manual P 337 0.4623 50 0.24 24
IV.CSNT.HHZ. 2018-10-23T18:52:39.88 0.6 undecidable manual S 125 0.2518 50 -0.14 51
IV.MAGO.HHN. 2018-10-23T18:52:39.18 0.1 undecidable manual P 216 0.4281 50 0.44 93
GU.MAIM.HHZ. 2018-10-23T18:52:39.63 0.1 undecidable manual P 309 0.4748 50 0.09 99
IV.TRIF.HHE. 2018-10-23T18:52:39.94 0.1 undecidable manual P 189 0.509 50 -0.2 97
IV.MPPT.EHZ. 2018-10-23T18:52:37.49 0.1 undecidable manual P 10 0.3435 50 0.19 100
IV.PII.HHZ. 2018-10-23T18:52:37.37 0.6 negative manual P 287 0.3633 50 -0.27 49
IV.CRMI.HHZ. 2018-10-23T18:52:37.30 0.6 undecidable manual S 354 0.1781 117 -0.23 51
IV.CSNT.HHZ. 2018-10-23T18:52:35.40 1.0 undecidable manual P 125 0.2518 50 -0.33 25
IV.CRMI.HHZ. 2018-10-23T18:52:34.27 0.3 undecidable manual P 354 0.1781 117 -0.01 80
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CRMI.HHE. ML:1 7.33E-5 0.62 AML other m 2018-10-23T18:52:37.64
IV.CRMI.HHN. ML:0.8 5.215E-5 0.46 AML other m 2018-10-23T18:52:37.73
IV.NDIM.HNE. ML:2.9 0.0004725 0.28 AML other m 2018-10-23T18:52:56.69
IV.NDIM.HHN. ML:3 0.0005305 0.24 AML other m 2018-10-23T18:52:56.88
IV.NDIM.HHE. ML:3 0.000511 0.26 AML other m 2018-10-23T18:52:56.69
IV.PIEI.HHN. ML:1.6 2.485E-5 0.42 AML other m 2018-10-23T18:53:09.58
IV.PIEI.HHE. ML:1.6 3.16E-5 1.44 AML other m 2018-10-23T18:53:09.78
IV.NDIM.HNN. ML:4 0.00596 1.24 AML other m 2018-10-23T18:53:31.85
IV.VIVA.HHN. ML:3.7 0.000914 0.82 AML other m 2018-10-23T18:53:48.44
IV.VIVA.HHE. ML:4 0.001755 0.46 AML other m 2018-10-23T18:53:48.37
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download