Earthquake with magnitude of ML 1.1 on date 26-02-2020 and time 22:15:24 (UTC) in region 2 km SW Montespertoli (FI)

A magnitude ML 1.1 earthquake occured in region: 2 km SW Montespertoli (FI), on

  • 26-02-2020 22:15:24 (UTC)
  • 26-02-2020 23:15:24 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.63, 11.06 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
Montespertoli FI 2 13537 13537
Castelfiorentino FI 7 17504 31041
Certaldo FI 9 16121 47162
San Casciano in Val di Pesa FI 11 17062 64224
Montelupo Fiorentino FI 12 14098 78322
Tavarnelle Val di Pesa FI 12 7800 86122
Gambassi Terme FI 13 4870 90992
Barberino Val d'Elsa FI 13 4386 95378
Empoli FI 14 48109 143487
Montaione FI 14 3700 147187
Capraia e Limite FI 14 7670 154857
Lastra a Signa FI 16 20156 175013
Impruneta FI 17 14615 189628
San Miniato PI 18 27934 217562
Signa FI 18 19179 236741
Scandicci FI 18 50609 287350
San Gimignano SI 18 7820 295170
Poggibonsi SI 19 29196 324366

Municipalities with at least 50000 inhabitants

An earthquake occurred to
18 Km SW of Scandicci (50609 inhabitants)
23 Km SW of Firenze (382808 inhabitants)
28 Km S of Prato (191150 inhabitants)
36 Km SE of Pistoia (90315 inhabitants)
41 Km NW of Siena (53903 inhabitants)
51 Km E of Lucca (89046 inhabitants)
54 Km E of Pisa (89158 inhabitants)
61 Km E of Livorno (159219 inhabitants)
69 Km W of Arezzo (99543 inhabitants)
70 Km E of Viareggio (62467 inhabitants)
86 Km SE of Massa (69479 inhabitants)
92 Km SE of Carrara (63133 inhabitants)
96 Km SW of Imola (69797 inhabitants)
97 Km N of Grosseto (82087 inhabitants)
99 Km SW of Faenza (58541 inhabitants)
99 Km S of Bologna (386663 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 1.1 2020-02-26
22:15:24
43.63 11.06 9 2020-02-26
22:44:48
Sala Sismica INGV-Roma 76851141
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-02-26 22:15:24 ± 0.13
Latitude 43.63 ± 0.01
Longitude 11.06 ± 0.01
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 76851141

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1031
Semi-minor axis of confidence ellipse (meter) 402
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 229
Circular confidence region, given by single value of horizontal uncertainty (meter) 1030
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 92
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 14
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
Epicentral distance of station farthest from the epicenter (degree) 0.5252
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.1

Field Value
Value 1.1
Uncertainty 0.3
Num. used stations 6
Type of magnitude ML
Reference to an origin 76851141
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-02-26 22:44:48
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.RIBO.EHZ.01 2020-02-26T22:15:46.67 3.0 undecidable manual S -5.87 0
IV.RUFI.EHZ. 2020-02-26T22:15:38.27 0.3 undecidable manual S 57 0.3876 50 -0.16 94
IV.SF14.HHZ. 2020-02-26T22:15:37.75 3.0 undecidable manual P 0
IV.MPPT.EHZ. 2020-02-26T22:15:36.44 0.3 undecidable manual S 4 0.3301 50 -0.28 93
IV.TRIF.CHN. 2020-02-26T22:15:35.34 1.0 undecidable manual P 192 0.5252 50 0.65 27
IV.RONT.HHZ. 2020-02-26T22:15:34.21 0.3 undecidable manual P 36 0.4542 50 0.74 78
IV.RINC.HHZ. 2020-02-26T22:15:34.09 0.6 undecidable manual P 57 0.473 50 0.31 60
IV.CSNT.HHZ. 2020-02-26T22:15:33.06 0.3 undecidable manual S 133 0.2284 109 -0.27 95
IV.PII.HHN. 2020-02-26T22:15:32.27 0.3 undecidable manual P 284 0.3966 50 -0.21 93
IV.RUFI.EHZ. 2020-02-26T22:15:32.24 0.3 undecidable manual P 57 0.3876 50 -0.09 95
IV.OSSC.HHZ. 2020-02-26T22:15:31.41 0.3 undecidable manual S 128 0.1718 115 0.12 99
IV.MPPT.EHZ. 2020-02-26T22:15:31.24 0.3 undecidable manual P 4 0.3301 50 -0.1 96
IV.CRMI.HHZ. 2020-02-26T22:15:31.37 0.3 undecidable manual S 341 0.1763 114 -0.1 99
IV.CSNT.HHZ. 2020-02-26T22:15:29.19 0.3 undecidable manual P 133 0.2284 109 -0.2 96
IV.OSSC.HHZ. 2020-02-26T22:15:28.27 0.3 undecidable manual P 128 0.1718 115 0.06 100
IV.CRMI.HHZ. 2020-02-26T22:15:28.51 0.3 undecidable manual P 341 0.1763 114 0.2 97
IV.FIR.HHZ. 2020-02-26T22:15:26.74 3.0 undecidable manual P -0.38 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.OSSC.HHE. ML:1.2 0.00013879505 0.4992 AML other m 2020-02-26T22:15:31.87
IV.OSSC.HHN. ML:1.2 0.00011269644 1.3824 AML other m 2020-02-26T22:15:31.65
IV.CRMI.HHE. ML:0.7 4.2279665E-5 0.6528 AML other m 2020-02-26T22:15:31.77
IV.CRMI.HHN. ML:0.8 5.0564245E-5 0.4992 AML other m 2020-02-26T22:15:31.37
IV.MPPT.EHE. ML:1.3 8.181871E-5 0.4608 AML other m 2020-02-26T22:15:36.51
IV.MPPT.EHN. ML:1.3 8.067952E-5 1.152 AML other m 2020-02-26T22:15:36.67
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