Earthquake with magnitude of ML 0.7 on date 20-05-2018 and time 21:52:21 (Italy) in region 4 km SW Tredozio (FC)

A magnitude ML 0.7 earthquake occured in region: 4 km SW Tredozio (FC), on

  • 20-05-2018 19:52:21 (UTC)
  • 20-05-2018 21:52:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.06, 11.7 at 3 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
Tredozio FC 4 1212 1212
Marradi FI 7 3139 4351
Portico e San Benedetto FC 7 756 5107
Premilcuore FC 11 799 5906
Rocca San Casciano FC 11 1910 7816
Modigliana FC 13 4560 12376
Palazzuolo sul Senio FI 14 1154 13530
San Godenzo FI 16 1167 14697
Dovadola FC 17 1653 16350
Galeata FC 18 2516 18866
Brisighella RA 19 7639 26505
Casola Valsenio RA 19 2617 29122
Civitella di Romagna FC 20 3786 32908

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Faenza (58541 inhabitants)
33 Km SW of Forlì (117913 inhabitants)
33 Km S of Imola (69797 inhabitants)
44 Km W of Cesena (96758 inhabitants)
48 Km NE of Firenze (382808 inhabitants)
52 Km E of Prato (191150 inhabitants)
53 Km NE of Scandicci (50609 inhabitants)
56 Km SE of Bologna (386663 inhabitants)
56 Km SW of Ravenna (159116 inhabitants)
64 Km E of Pistoia (90315 inhabitants)
67 Km N of Arezzo (99543 inhabitants)
69 Km W of Rimini (147750 inhabitants)
87 Km S of Ferrara (133155 inhabitants)
87 Km NE of Siena (53903 inhabitants)
90 Km SE of Modena (184973 inhabitants)
98 Km W of Pesaro (94582 inhabitants)
99 Km E of Lucca (89046 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 0.7 2018-05-20
19:52:21
44.06 11.7 3 2018-05-20
19:59:41
Sala Sismica INGV-Roma 57049651
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-05-20 19:52:21 ± 0.17
Latitude 44.06 ± 0.01
Longitude 11.70 ± 0.01
Depth (km) 3 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 57049651

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1097
Semi-minor axis of confidence ellipse (meter) 341
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 93
Circular confidence region, given by single value of horizontal uncertainty (meter) 1100
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 161
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 10
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) 0.2698
Number of stations at which the event was observed 6
Number of stations from which data was used for origin computation 5
Magnitude information

ML:0.7

Field Value
Value 0.7
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 57049651
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-05-20 19:59:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.RUFI.EHZ. 2018-05-20T19:52:32.44 0.3 undecidable manual S 212 0.2599 96 0.42 66
IV.ASQU.HHZ. 2018-05-20T19:52:32.49 0.3 undecidable manual S 166 0.2698 96 0.12 70
IV.BRSN.EHZ. 2018-05-20T19:52:30.59 3.0 negative manual P 0.55 0
IV.BRIS.HHZ. 2018-05-20T19:52:29.11 0.3 undecidable manual S 16 0.1718 100 0.46 66
IV.SFI.EHZ. 2018-05-20T19:52:29.51 0.3 undecidable manual S 146 0.1862 99 0.32 68
IV.RUFI.EHZ. 2018-05-20T19:52:27.59 0.1 undecidable manual P 212 0.2599 96 -0.16 93
IV.ASQU.HHZ. 2018-05-20T19:52:27.61 0.1 undecidable manual P 166 0.2698 96 -0.35 89
IV.BRIS.HHZ. 2018-05-20T19:52:25.69 0.1 undecidable manual P 16 0.1718 100 -0.12 95
IV.SFI.EHZ. 2018-05-20T19:52:25.95 0.1 undecidable manual P 146 0.1862 99 -0.17 94
IV.LMD.HHZ. 2018-05-20T19:52:23.28 0.1 undecidable manual S 13 0.0189 147 0.01 100
IV.LMD.HHZ. 2018-05-20T19:52:22.53 0.1 undecidable manual P 13 0.0189 147 -0.17 97
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SFI.EHN. ML:0.6 3.65E-5 0.12 AML other m 2018-05-20T19:52:30.00
IV.SFI.EHE. ML:0.6 3.74E-5 1.4 AML other m 2018-05-20T19:52:30.10
IV.BRIS.HHN. ML:0.8 5.39E-5 0.62 AML other m 2018-05-20T19:52:32.62
IV.ASQU.HHE. ML:0.6 2.205E-5 0.66 AML other m 2018-05-20T19:52:32.61
IV.ASQU.HHN. ML:0.6 2.21E-5 1.38 AML other m 2018-05-20T19:52:32.95
IV.BRIS.HHE. ML:0.8 4.86E-5 0.46 AML other m 2018-05-20T19:52:33.64
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