Earthquake with magnitude of ML 0.8 on date 31-08-2020 and time 22:08:21 (UTC) in region 3 km W Marradi (FI)

A magnitude ML 0.8 earthquake occured in region: 3 km W Marradi (FI), on

  • 31-08-2020 22:08:21 (UTC)
  • 01-09-2020 00:08:21 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.09, 11.58 at 10 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
Marradi FI 3 3139 3139
Palazzuolo sul Senio FI 4 1154 4293
Tredozio FC 13 1212 5505
Castel del Rio BO 15 1246 6751
Casola Valsenio RA 16 2617 9368
Firenzuola FI 17 4726 14094
Portico e San Benedetto FC 17 756 14850
San Godenzo FI 18 1167 16017
Modigliana FC 19 4560 20577
Fontanelice BO 19 1943 22520
Vicchio FI 20 8044 30564
Premilcuore FC 20 799 31363

Municipalities with at least 50000 inhabitants

An earthquake occurred to
31 Km SW of Imola (69797 inhabitants)
33 Km SW of Faenza (58541 inhabitants)
40 Km W of Forlì (117913 inhabitants)
44 Km NE of Firenze (382808 inhabitants)
45 Km NE of Prato (191150 inhabitants)
49 Km NE of Scandicci (50609 inhabitants)
49 Km SE of Bologna (386663 inhabitants)
53 Km W of Cesena (96758 inhabitants)
56 Km E of Pistoia (90315 inhabitants)
61 Km SW of Ravenna (159116 inhabitants)
73 Km NW of Arezzo (99543 inhabitants)
79 Km W of Rimini (147750 inhabitants)
81 Km SE of Modena (184973 inhabitants)
83 Km S of Ferrara (133155 inhabitants)
88 Km N of Siena (53903 inhabitants)
91 Km E of Lucca (89046 inhabitants)
95 Km SE of Carpi (70699 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
Reviewed
Rev100
ML 0.8 2020-08-31
22:08:21
44.09 11.58 10 2020-08-31
22:17:36
Sala Sismica INGV-Roma 82507621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-31 22:08:21 ± 0.09
Latitude 44.09 ± 0.01
Longitude 11.58 ± 0.01
Depth (km) 10 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 82507621

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 597
Semi-minor axis of confidence ellipse (meter) 534
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 300
Circular confidence region, given by single value of horizontal uncertainty (meter) 600
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 87
Number of associated phases, regardless of their use for origin computation 17
Number of defining phases 17
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) 0.14389
Epicentral distance of station farthest from the epicenter (degree) 0.8022
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 10
Magnitude information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 5
Type of magnitude ML
Reference to an origin 82507621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-31 22:17:36
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.APEC.HHZ. 2020-08-31T22:08:35.59 0.3 undecidable manual P 131 0.8022 50 -0.81 53
IV.ASQU.HHE. 2020-08-31T22:08:33.91 0.6 undecidable manual S 153 0.3265 50 0.42 45
IV.RUFI.EHZ. 2020-08-31T22:08:31.34 0.6 undecidable manual S 192 0.2554 50 -0.03 49
IV.RINC.HHZ. 2020-08-31T22:08:29.76 0.6 undecidable manual S 175 0.2023 114 0.05 50
IV.BRIS.HHZ. 2020-08-31T22:08:29.63 0.6 undecidable manual S 44 0.1889 116 0.38 46
IV.SEI.HHZ. 2020-08-31T22:08:28.59 0.6 undecidable manual S 258 0.1646 119 0.17 49
IV.ASQU.HHE. 2020-08-31T22:08:28.28 0.3 undecidable manual P 153 0.3265 50 0.01 73
IV.SFI.HNZ. 2020-08-31T22:08:27.07 0.3 undecidable manual P 134 0.2635 50 -0.12 72
IV.VISG.HHZ. 2020-08-31T22:08:27.40 0.6 undecidable manual S 313 0.1466 122 -0.42 46
IV.RONT.HHZ. 2020-08-31T22:08:27.89 0.6 undecidable manual S 229 0.1439 123 0.17 49
IV.MTRZ.HHZ. 2020-08-31T22:08:27.52 0.3 undecidable manual P 333 0.2518 50 0.54 66
IV.RUFI.EHZ. 2020-08-31T22:08:26.96 0.3 undecidable manual P 192 0.2554 50 -0.09 73
IV.RINC.HHZ. 2020-08-31T22:08:26.14 0.3 undecidable manual P 175 0.2023 114 0.05 74
IV.RONT.HHZ. 2020-08-31T22:08:25.12 0.3 undecidable manual P 229 0.1439 123 0.18 73
IV.SEI.HHZ. 2020-08-31T22:08:25.23 0.3 undecidable manual P 258 0.1646 119 -0.12 74
IV.BRIS.HHZ. 2020-08-31T22:08:25.81 0.1 undecidable manual P 44 0.1889 116 -0.02 100
IV.VISG.HHZ. 2020-08-31T22:08:24.75 0.3 undecidable manual P 313 0.1466 122 -0.25 72
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VISG.HHN. ML:0.7 4.1148215E-5 0.1408 AML other m 2020-08-31T22:08:28.38
IV.VISG.HHE. ML:0.4 2.518807E-5 0.2048 AML other m 2020-08-31T22:08:28.61
IV.RONT.HHE. ML:0.9 6.767146E-5 0.2304 AML other m 2020-08-31T22:08:29.29
IV.RONT.HHN. ML:0.9 7.2938505E-5 0.128 AML other m 2020-08-31T22:08:29.63
IV.SEI.HHN. ML:0.9 6.348367E-5 0.2816 AML other m 2020-08-31T22:08:31.02
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download