Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 04-08-2020 and time 04:34:09 (UTC) in region 7 km W Sassoferrato (AN)

A magnitude ML 1.4 earthquake occured in region: 7 km W Sassoferrato (AN), on

  • 04-08-2020 04:34:09 (UTC)
  • 04-08-2020 06:34:09 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4240, 12.7690 at 13 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.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Sassoferrato AN 8 7285 7285
Serra Sant'Abbondio PU 8 1027 8312
Scheggia e Pascelupo PG 8 1393 9705
Costacciaro PG 8 1216 10921
Sigillo PG 10 2404 13325
Frontone PU 11 1300 14625
Cantiano PU 13 2245 16870
Genga AN 14 1797 18667
Fossato di Vico PG 14 2840 21507
Fabriano AN 15 31480 52987
Arcevia AN 16 4612 57599
Pergola PU 17 6333 63932
Cagli PU 17 8731 72663
Gubbio PG 17 32216 104879

Municipalities with at least 50000 inhabitants

An earthquake occurred to
47 Km NE of Perugia (166134 inhabitants)
51 Km SW of Fano (60888 inhabitants)
52 Km N of Foligno (57155 inhabitants)
55 Km S of Pesaro (94582 inhabitants)
64 Km W of Ancona (100861 inhabitants)
72 Km E of Arezzo (99543 inhabitants)
73 Km S of Rimini (147750 inhabitants)
90 Km SE of Cesena (96758 inhabitants)
96 Km N of Terni (111501 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.4 2020-08-04
04:34:09		 43.4238 12.7688 13 2020-08-04
04:55:58		 Sala Sismica INGV-Roma 81627101
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2020-08-04 04:34:09 ± 0.07
Latitude 43.4238 ± 0.0018
Longitude 12.7688 ± 0.0037
Depth (km) 13 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 81627101

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 340
Semi-minor axis of confidence ellipse (meter) 69
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 258
Circular confidence region, given by single value of horizontal uncertainty (meter) 340.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 52
Number of associated phases, regardless of their use for origin computation 24
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.14
Epicentral distance of station closest to the epicenter (degree) 0.01529
Epicentral distance of station farthest from the epicenter (degree) 0.38941
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitude information

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 81627101
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2020-08-04 04:55:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2020-08-04T04:34:23.21 0.6 undecidable manual S 192 43.2234 93 0.07 47
IV.MURB.HHZ. 2020-08-04T04:34:19.14 0.6 undecidable manual S 228 26.5512 97 0.43 45
IV.EL6.EHZ. 2020-08-04T04:34:19.62 0.6 undecidable manual S 111 28.8489 96 0.32 46
IV.ATCC.EHZ. 2020-08-04T04:34:19.66 0.6 undecidable manual S 202 28.4493 97 0.45 44
IV.SNTG.HHZ. 2020-08-04T04:34:17.79 0.6 undecidable manual S 143 23.2545 100 -0.06 48
IV.ASSB.HHZ. 2020-08-04T04:34:17.02 0.3 undecidable manual P 192 43.2234 93 -0.2 68
IV.PIEI.HHZ. 2020-08-04T04:34:17.30 0.6 undecidable manual S 303 22.5552 100 -0.35 46
IV.MPAG.EHZ. 2020-08-04T04:34:17.79 0.6 undecidable manual S 358 22.755 100 0.08 48
IV.ARVD.HHZ. 2020-08-04T04:34:16.00 0.6 undecidable manual S 59 16.1727 111 0 49
IV.FOSV.EHZ. 2020-08-04T04:34:15.32 0.6 undecidable manual S 183 14.3745 116 -0.23 47
IV.EL6.EHZ. 2020-08-04T04:34:15.00 0.6 undecidable manual P 111 28.8489 96 0 48
IV.MPAG.EHZ. 2020-08-04T04:34:14.05 0.3 positive manual P 358 22.755 100 -0.03 73
IV.SNTG.HHZ. 2020-08-04T04:34:14.06 0.1 undecidable manual P 143 23.2545 100 -0.1 95
IV.FRON.EHZ. 2020-08-04T04:34:14.81 0.6 undecidable manual S 342 10.9779 127 0.02 50
IV.MURB.HHZ. 2020-08-04T04:34:14.77 1.0 negative manual P 228 26.5512 97 0.11 24
IV.ATCC.EHZ. 2020-08-04T04:34:14.94 0.3 positive manual P 202 28.4493 97 -0.01 72
IV.ATSC.EHE. 2020-08-04T04:34:13.89 0.6 undecidable manual S 270 6.6933 145 -0.09 50
IV.SSFR.HHZ. 2020-08-04T04:34:13.50 0.6 undecidable manual S 38 1.6983 170 0.01 50
IV.ARVD.HHZ. 2020-08-04T04:34:13.13 0.1 positive manual P 59 16.1727 111 0.04 99
IV.PIEI.HHZ. 2020-08-04T04:34:13.80 1.0 negative manual P 303 22.5552 100 -0.25 23
IV.FOSV.EHZ. 2020-08-04T04:34:12.76 0.3 undecidable manual P 183 14.3745 116 -0.08 73
IV.FRON.EHZ. 2020-08-04T04:34:12.40 0.1 positive manual P 342 10.9779 127 0 100
IV.ATSC.EHE. 2020-08-04T04:34:11.98 0.1 undecidable manual P 270 6.6933 145 0.05 100
IV.SSFR.HHZ. 2020-08-04T04:34:11.66 0.3 undecidable manual P 38 1.6983 170 0.01 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SSFR.HNN. ML:2.1 0.0016 0.34 AML other m 2020-08-04T04:34:13.79
IV.SSFR.HNE. ML:1.9 0.001135 0.24 AML other m 2020-08-04T04:34:13.76
IV.SSFR.HHN. ML:1.6 0.000646 0.74 AML other m 2020-08-04T04:34:13.54
IV.SSFR.HHE. ML:1.6 0.000509 1.22 AML other m 2020-08-04T04:34:14.63
IV.FRON.EHE. ML:1.0 0.00011599999999999999 0.1 AML other m 2020-08-04T04:34:14.85
IV.FRON.EHN. ML:1.2 0.000168 0.1 AML other m 2020-08-04T04:34:14.86
IV.FOSV.EHN. ML:1.3 0.000188 0.14 AML other m 2020-08-04T04:34:15.47
IV.FOSV.EHE. ML:1.4 0.00022649999999999998 0.08 AML other m 2020-08-04T04:34:15.57
IV.ARVD.HHN. ML:1.2 0.000135 1.22 AML other m 2020-08-04T04:34:16.11
IV.ARVD.HHE. ML:1.3 0.0001735 0.52 AML other m 2020-08-04T04:34:16.37
IV.SNTG.HHN. ML:1.1 0.0000775 0.28 AML other m 2020-08-04T04:34:18.56
IV.SNTG.HHE. ML:1.1 0.00007209999999999999 1.2 AML other m 2020-08-04T04:34:19.24
IV.MURB.HHE. ML:1.5 0.0001625 0.98 AML other m 2020-08-04T04:34:19.84
IV.ATCC.EHE. ML:1.6 0.00019 1.42 AML other m 2020-08-04T04:34:19.01
IV.ATCC.EHN. ML:1.5 0.00015999999999999999 0.14 AML other m 2020-08-04T04:34:19.78
IV.MURB.HHN. ML:1.5 0.00017549999999999998 0.16 AML other m 2020-08-04T04:34:20.81
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download