INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 1.0 on date 12-10-2018 and time 10:55:02 (Italy) in region 5 km N Borgo San Lorenzo (FI)

A magnitude ML 1.0 earthquake occured in region: 5 km N Borgo San Lorenzo (FI), on

  • 12-10-2018 08:55:02 (UTC)
  • 12-10-2018 10:55:02 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44, 11.4 at 9 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
Borgo San Lorenzo FI 5 18211 18211
Scarperia e San Piero FI 7 12217 30428
Vicchio FI 9 8044 38472
Barberino di Mugello FI 13 10836 49308
Firenzuola FI 14 4726 54034
Vaglia FI 14 5073 59107
Dicomano FI 15 5515 64622
Palazzuolo sul Senio FI 18 1154 65776
Marradi FI 19 3139 68915
San Godenzo FI 19 1167 70082

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km E of Prato (191150 inhabitants)
28 Km NE of Firenze (382808 inhabitants)
32 Km NE of Scandicci (50609 inhabitants)
39 Km E of Pistoia (90315 inhabitants)
47 Km SW of Imola (69797 inhabitants)
50 Km SW of Faenza (58541 inhabitants)
56 Km S of Bologna (386663 inhabitants)
57 Km W of Forlì (117913 inhabitants)
69 Km W of Cesena (96758 inhabitants)
71 Km NW of Arezzo (99543 inhabitants)
74 Km E of Lucca (89046 inhabitants)
76 Km N of Siena (53903 inhabitants)
79 Km SW of Ravenna (159116 inhabitants)
81 Km SE of Modena (184973 inhabitants)
86 Km E of Pisa (89158 inhabitants)
93 Km E of Viareggio (62467 inhabitants)
94 Km W of Rimini (147750 inhabitants)
95 Km S of Ferrara (133155 inhabitants)
96 Km SE of Carpi (70699 inhabitants)
99 Km SE of Reggio nell'Emilia (171345 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 1.0 2018-10-12
08:55:02
44 11.4 9 2018-10-12
09:06:01
Sala Sismica INGV-Roma 61870831
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-10-12 08:55:02 ± 0.12
Latitude 44.00 ± 0.00
Longitude 11.40 ± 0.00
Depth (km) 9 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 61870831

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 353
Semi-minor axis of confidence ellipse (meter) 191
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 186
Circular confidence region, given by single value of horizontal uncertainty (meter) 350
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 119
Number of associated phases, regardless of their use for origin computation 9
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.23472
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 4
Magnitude information

ML:1

Field Value
Value 1
Uncertainty 0.1
Num. used stations 4
Type of magnitude ML
Reference to an origin 61870831
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-10-12 09:06:01
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.PE3.EHZ. 2018-10-12T08:55:16.72 3.0 negative manual Pg -0.01 0
IV.LMD.HHE. 2018-10-12T08:55:12.24 0.3 undecidable manual S 70 0.2347 109 -0.01 74
IV.RUFI.EHZ. 2018-10-12T08:55:10.22 0.6 undecidable manual S 154 0.1781 115 0 50
IV.MOCL.EHZ. 2018-10-12T08:55:09.37 0.3 undecidable manual S 273 0.1574 118 -0.15 73
IV.LMD.HHE. 2018-10-12T08:55:08.11 0.1 undecidable manual P 70 0.2347 109 -0.09 98
IV.RUFI.EHZ. 2018-10-12T08:55:07.10 1.0 negative manual P 154 0.1781 115 0.07 25
IV.SEI.HHZ. 2018-10-12T08:55:06.66 0.3 undecidable manual S 332 0.0639 142 -0.02 77
IV.MOCL.EHZ. 2018-10-12T08:55:06.70 0.1 undecidable manual P 273 0.1574 118 0.08 99
IV.SEI.HHZ. 2018-10-12T08:55:05.11 0.1 positive manual P 332 0.0639 142 0.12 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SEI.HHN. ML:1 0.0001776392 0.4032 AML other m 2018-10-12T08:55:07.05
IV.SEI.HHE. ML:0.8 0.000104641365 0.16 AML other m 2018-10-12T08:55:07.09
IV.MOCL.EHE. ML:1 8.1999085E-5 0.1024 AML other m 2018-10-12T08:55:09.84
IV.MOCL.EHN. ML:1 9.5635775E-5 0.16 AML other m 2018-10-12T08:55:09.76
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