Earthquake with magnitude of ML 0.8 on date 22-08-2018 and time 09:35:34 (Italy) in region 3 km E Sesto Fiorentino (FI)

A magnitude ML 0.8 earthquake occured in region: 3 km E Sesto Fiorentino (FI), on

  • 22-08-2018 07:35:34 (UTC)
  • 22-08-2018 09:35:34 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.83, 11.24 at 5 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
Sesto Fiorentino FI 3 48958 48958
Fiesole FI 5 13969 62927
Calenzano FI 7 17489 80416
Firenze FI 7 382808 463224
Campi Bisenzio FI 8 46166 509390
Scandicci FI 9 50609 559999
Vaglia FI 9 5073 565072
Bagno a Ripoli FI 11 25611 590683
Signa FI 12 19179 609862
Prato PO 12 191150 801012
Lastra a Signa FI 12 20156 821168
Poggio a Caiano PO 14 10007 831175
Impruneta FI 16 14615 845790
Scarperia e San Piero FI 16 12217 858007
Carmignano PO 17 14450 872457
Pontassieve FI 18 20603 893060
Vaiano PO 18 9895 902955
Borgo San Lorenzo FI 19 18211 921166
Barberino di Mugello FI 19 10836 932002
Montemurlo PO 19 18456 950458
San Casciano in Val di Pesa FI 20 17062 967520
Agliana PT 20 17525 985045

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km N of Firenze (382808 inhabitants)
9 Km NE of Scandicci (50609 inhabitants)
12 Km E of Prato (191150 inhabitants)
28 Km E of Pistoia (90315 inhabitants)
58 Km N of Siena (53903 inhabitants)
59 Km E of Lucca (89046 inhabitants)
66 Km NW of Arezzo (99543 inhabitants)
68 Km E of Pisa (89158 inhabitants)
70 Km SW of Imola (69797 inhabitants)
72 Km SW of Faenza (58541 inhabitants)
74 Km S of Bologna (386663 inhabitants)
78 Km SW of Forlì (117913 inhabitants)
79 Km E of Viareggio (62467 inhabitants)
81 Km E of Livorno (159219 inhabitants)
88 Km W of Cesena (96758 inhabitants)
90 Km E of Massa (69479 inhabitants)
94 Km S of Modena (184973 inhabitants)
95 Km E of Carrara (63133 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 0.8 2018-08-22
07:35:34
43.83 11.24 5 2018-08-22
07:40:17
Sala Sismica INGV-Roma 60061091
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-08-22 07:35:34 ± 0.13
Latitude 43.83 ± 0.00
Longitude 11.24 ± 0.00
Depth (km) 5 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 60061091

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 290
Semi-minor axis of confidence ellipse (meter) 68
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 180
Circular confidence region, given by single value of horizontal uncertainty (meter) 290
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 171
Number of associated phases, regardless of their use for origin computation 10
Number of defining phases 10
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) 0.16278
Epicentral distance of station farthest from the epicenter (degree) 0.23922
Number of stations at which the event was observed 5
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 8
Type of magnitude ML
Reference to an origin 60061091
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-08-22 07:40:17
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.SEI.HHZ. 2018-08-22T07:35:44.41 0.6 undecidable manual S 22 0.2392 102 0.24 47
IV.RUFI.EHZ. 2018-08-22T07:35:42.57 0.1 undecidable manual S 88 0.1979 104 -0.05 100
IV.CRMI.HHZ. 2018-08-22T07:35:42.24 0.3 undecidable manual S 259 0.188 105 0 75
IV.MPPT.EHZ. 2018-08-22T07:35:41.38 0.1 undecidable manual S 320 0.1628 107 0.05 100
IV.MOCL.EHZ. 2018-08-22T07:35:41.78 0.3 undecidable manual S 347 0.1772 105 -0.07 75
IV.SEI.HHZ. 2018-08-22T07:35:40.19 0.1 undecidable manual P 22 0.2392 102 -0.01 100
IV.CRMI.HHZ. 2018-08-22T07:35:39.17 0.1 undecidable manual P 259 0.188 105 0.09 99
IV.RUFI.EHZ. 2018-08-22T07:35:39.37 0.6 positive manual P 88 0.1979 104 0.07 50
IV.MOCL.EHZ. 2018-08-22T07:35:38.79 0.6 negative manual P 347 0.1772 105 -0.06 50
IV.MPPT.EHZ. 2018-08-22T07:35:38.40 0.1 undecidable manual P 320 0.1628 107 -0.15 98
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MPPT.EHN. ML:0.6 3.83E-5 0.2 AML other m 2018-08-22T07:35:41.70
IV.MOCL.EHE. ML:1 8.565E-5 1.84 AML other m 2018-08-22T07:35:42.96
IV.MOCL.EHN. ML:1 7.475E-5 0.66 AML other m 2018-08-22T07:35:42.38
IV.MPPT.EHE. ML:0.5 3.07E-5 0.26 AML other m 2018-08-22T07:35:42.43
IV.CRMI.HHE. ML:0.7 4.135E-5 1.28 AML other m 2018-08-22T07:35:42.71
IV.CRMI.HHN. ML:0.7 3.825E-5 0.32 AML other m 2018-08-22T07:35:42.58
IV.SEI.HHN. ML:1.1 6.87E-5 0.72 AML other m 2018-08-22T07:35:45.09
IV.SEI.HHE. ML:0.8 3.485E-5 1.7 AML other m 2018-08-22T07:35:46.00
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