Earthquake with magnitude of ML 1.8 on date 20-01-2020 and time 04:39:52 (Italy) in region 2 km E Gambassi Terme (FI)

A magnitude ML 1.8 earthquake occured in region: 2 km E Gambassi Terme (FI), on

  • 20-01-2020 03:39:52 (UTC)
  • 20-01-2020 04:39:52 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 43.53, 10.98 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
Gambassi Terme FI 2 4870 4870
Certaldo FI 5 16121 20991
Montaione FI 6 3700 24691
Castelfiorentino FI 8 17504 42195
San Gimignano SI 9 7820 50015
Montespertoli FI 14 13537 63552
Poggibonsi SI 15 29196 92748
Barberino Val d'Elsa FI 15 4386 97134
Tavarnelle Val di Pesa FI 16 7800 104934
Colle di Val d'Elsa SI 17 21620 126554
Volterra PI 18 10519 137073
Palaia PI 19 4612 141685
San Miniato PI 19 27934 169619

Municipalities with at least 50000 inhabitants

An earthquake occurred to
30 Km SW of Scandicci (50609 inhabitants)
34 Km SW of Firenze (382808 inhabitants)
37 Km NW of Siena (53903 inhabitants)
40 Km S of Prato (191150 inhabitants)
45 Km S of Pistoia (90315 inhabitants)
51 Km E of Pisa (89158 inhabitants)
52 Km SE of Lucca (89046 inhabitants)
54 Km E of Livorno (159219 inhabitants)
70 Km SE of Viareggio (62467 inhabitants)
73 Km W of Arezzo (99543 inhabitants)
87 Km N of Grosseto (82087 inhabitants)
88 Km SE of Massa (69479 inhabitants)
93 Km SE 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 1.8 2020-01-20
03:39:52
43.53 10.98 9 2020-01-20
03:49:54
Sala Sismica INGV-Roma 75667781
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-01-20 03:39:52 ± 0.15
Latitude 43.53 ± 0.01
Longitude 10.98 ± 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 75667781

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 807
Semi-minor axis of confidence ellipse (meter) 622
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 65
Circular confidence region, given by single value of horizontal uncertainty (meter) 810
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 20
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.38
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.60974
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 24
Type of magnitude ML
Reference to an origin 75667781
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-01-20 03:49:54
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2020-01-20T03:40:09.26 0.3 undecidable manual S 51 0.4883 50 -0.22 68
IV.A317A.HHZ. 2020-01-20T03:40:08.43 3.0 undecidable manual P 0
IV.TRIF.CHN. 2020-01-20T03:40:06.71 0.3 undecidable manual S 188 0.4227 50 -0.83 57
IV.MAGO.CHE. 2020-01-20T03:40:05.50 0.3 undecidable manual S 222 0.3507 50 0.09 72
IV.PII.HHZ. 2020-01-20T03:40:05.49 0.3 undecidable manual S 300 0.3804 50 -0.79 58
GU.CARD.HHZ. 2020-01-20T03:40:04.29 0.3 undecidable manual P 324 0.6097 50 0.08 68
IV.FROS.CHZ. 2020-01-20T03:40:04.75 0.3 undecidable manual S 159 0.348 50 -0.57 64
IV.BDI.HHZ. 2020-01-20T03:40:04.24 0.1 undecidable manual P 332 0.598 50 0.24 89
IV.RONT.HHZ. 2020-01-20T03:40:04.20 0.3 undecidable manual P 35 0.563 50 0.78 56
GU.POPM.HHZ. 2020-01-20T03:40:03.22 0.1 undecidable manual P 342 0.536 50 0.27 89
IV.RUFI.EHZ. 2020-01-20T03:40:02.24 0.1 undecidable manual P 51 0.4883 50 0.12 93
IV.CRMI.HHZ. 2020-01-20T03:40:01.96 0.3 undecidable manual S 360 0.2617 107 -0.67 63
IV.CSNT.HHZ. 2020-01-20T03:40:01.10 0.3 undecidable manual S 105 0.232 109 -0.43 69
IV.TRIF.CHN. 2020-01-20T03:40:01.70 0.3 undecidable manual P 188 0.4227 50 0.69 60
IV.OSSC.HHZ. 2020-01-20T03:40:00.14 0.3 undecidable manual S 93 0.1916 113 0.05 75
IV.MAGO.CHE. 2020-01-20T03:40:00.16 0.3 undecidable manual P 222 0.3507 50 0.38 68
IV.PII.HHZ. 2020-01-20T03:40:00.30 0.1 undecidable manual P 300 0.3804 50 0.02 97
IV.FROS.CHZ. 2020-01-20T03:39:59.93 0.1 undecidable manual P 159 0.348 50 0.2 94
IV.CRMI.HHZ. 2020-01-20T03:39:58.08 0.1 undecidable manual P 360 0.2617 107 -0.09 98
IV.CSNT.HHZ. 2020-01-20T03:39:57.54 0.1 undecidable manual P 105 0.232 109 0 100
IV.OSSC.HHZ. 2020-01-20T03:39:56.94 0.1 undecidable manual P 93 0.1916 113 0.23 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.RONT.HHN. ML:0 0.00028114395 0.1808 AML other m 2020-01-20T03:40:14.79
IV.RONT.HHE. ML:0 0.00035818395 0.32 AML other m 2020-01-20T03:40:15.36
IV.OSSC.HHE. ML:2 0.0008255284 0.2208 AML other m 2020-01-20T03:40:00.55
IV.OSSC.HHN. ML:1.8 0.00040286705 0.2 AML other m 2020-01-20T03:40:00.86
IV.OSSC.HNE. ML:1.8 0.0004441671 0.2096 AML other m 2020-01-20T03:40:00.86
IV.OSSC.HNN. ML:2 0.00083372425 0.2304 AML other m 2020-01-20T03:40:00.55
IV.CSNT.HHE. ML:1.8 0.00037353595 0.1392 AML other m 2020-01-20T03:40:01.83
IV.CSNT.HHN. ML:1.8 0.0003968481 0.0992 AML other m 2020-01-20T03:40:01.95
IV.CRMI.HNE. ML:1.8 0.00035870605 0.12 AML other m 2020-01-20T03:40:02.11
IV.CRMI.HNN. ML:1.7 0.0002800819 0.16 AML other m 2020-01-20T03:40:02.95
IV.CRMI.HHE. ML:1.5 0.0001644007 0.12 AML other m 2020-01-20T03:40:02.11
IV.CRMI.HHN. ML:1.4 0.000112714835 0.1808 AML other m 2020-01-20T03:40:02.06
IV.FROS.CHE. ML:2 0.00036217755 0.2 AML other m 2020-01-20T03:40:06.40
IV.FROS.CHN. ML:2.1 0.00041395015 0.16 AML other m 2020-01-20T03:40:06.40
IV.PII.HHE. ML:1.8 0.00021311495 0.1392 AML other m 2020-01-20T03:40:06.13
IV.PII.HHN. ML:1.8 0.0002088252 0.16 AML other m 2020-01-20T03:40:07.13
IV.RUFI.EHE. ML:1.5 7.545106E-5 0.8 AML other m 2020-01-20T03:40:10.67
IV.RUFI.EHN. ML:1.2 4.197987E-5 0.1808 AML other m 2020-01-20T03:40:09.92
GU.POPM.HHE. ML:1.8 0.0001449891 0.1984 AML other m 2020-01-20T03:40:11.90
GU.POPM.HHN. ML:1.7 0.000114816455 0.1792 AML other m 2020-01-20T03:40:12.02
IV.BDI.HHE. ML:1.5 5.7022555E-5 0.2992 AML other m 2020-01-20T03:40:15.92
IV.BDI.HHN. ML:1.4 4.4875405E-5 0.1408 AML other m 2020-01-20T03:40:13.21
GU.CARD.HHE. ML:1.6 7.173189E-5 0.3792 AML other m 2020-01-20T03:40:14.64
GU.CARD.HHN. ML:1.7 7.83375E-5 0.16 AML other m 2020-01-20T03:40:15.82
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