Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.5 on date 18-09-2021 and time 23:31:07 (UTC) in region 6 km W Sassoferrato (AN)

A magnitude ML 0.5 earthquake occured in region: 6 km W Sassoferrato (AN), on

  • 18-09-2021 23:31:07 (UTC)
  • 19-09-2021 01:31:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4140, 12.7940 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 6 7285 7285
Costacciaro PG 9 1216 8501
Serra Sant'Abbondio PU 9 1027 9528
Sigillo PG 10 2404 11932
Scheggia e Pascelupo PG 10 1393 13325
Genga AN 12 1797 15122
Frontone PU 12 1300 16422
Fabriano AN 12 31480 47902
Fossato di Vico PG 13 2840 50742
Cantiano PU 15 2245 52987
Arcevia AN 15 4612 57599
Pergola PU 17 6333 63932
Serra San Quirico AN 18 2850 66782
Gubbio PG 19 32216 98998
Cerreto d'Esi AN 19 3817 102815
Cagli PU 19 8731 111546

Municipalities with at least 50000 inhabitants

An earthquake occurred to
47 Km NE of Perugia (166134 inhabitants)
51 Km SW of Fano (60888 inhabitants)
51 Km N of Foligno (57155 inhabitants)
56 Km S of Pesaro (94582 inhabitants)
63 Km W of Ancona (100861 inhabitants)
74 Km E of Arezzo (99543 inhabitants)
74 Km S of Rimini (147750 inhabitants)
92 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 0.5 2021-09-18
23:31:07		 43.4138 12.7942 13 2021-09-18
23:36:25		 Sala Sismica INGV-Roma 95605731
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-09-18 23:31:07 ± 0.06
Latitude 43.4138 ± 0.0018
Longitude 12.7942 ± 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 95605731

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 279
Semi-minor axis of confidence ellipse (meter) 106
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 295
Circular confidence region, given by single value of horizontal uncertainty (meter) 280.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 94
Number of associated phases, regardless of their use for origin computation 18
Number of defining phases 16
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.13
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.25451
Number of stations at which the event was observed 10
Number of stations from which data was used for origin computation 8
Magnitude information

ML:0.5

Field Value
Value 0.5
Uncertainty 0.1
Num. used stations 6
Type of magnitude ML
Reference to an origin 95605731
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-09-18 23:36:25
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.EL6.EHZ. 2021-09-18T23:31:17.26 3.0 undecidable manual S -0.17 0
IV.NARO.HHZ. 2021-09-18T23:31:17.13 0.1 undecidable manual S 322 27.75 97 0.05 99
IV.ATCC.EHZ. 2021-09-18T23:31:17.27 0.1 undecidable manual S 206 28.2495 97 0.07 98
IV.MURB.HHZ. 2021-09-18T23:31:17.28 0.1 undecidable manual S 233 27.4503 98 0.29 93
IV.MPAG.EHZ. 2021-09-18T23:31:16.21 0.1 undecidable manual S 353 24.0537 100 0.12 98
IV.COR1.EHZ. 2021-09-18T23:31:15.65 3.0 undecidable manual S -0.61 0
IV.SNTG.HHZ. 2021-09-18T23:31:15.21 0.1 undecidable manual S 146 21.2676 103 -0.14 97
IV.ATFO.HHZ. 2021-09-18T23:31:14.58 0.1 undecidable manual S 254 18.6702 106 -0.12 98
IV.FRON.EHZ. 2021-09-18T23:31:13.13 0.1 undecidable manual S 334 12.7761 122 -0.12 99
IV.ARVD.HHZ. 2021-09-18T23:31:13.89 0.1 undecidable manual S 52 15.0738 115 0.09 100
IV.ATCC.EHZ. 2021-09-18T23:31:12.89 0.1 undecidable manual P 206 28.2495 97 -0.08 97
IV.MURB.HHZ. 2021-09-18T23:31:12.90 0.1 undecidable manual P 233 27.4503 98 0.06 98
IV.MPAG.EHZ. 2021-09-18T23:31:12.31 0.1 undecidable manual P 353 24.0537 100 -0.01 99
IV.NARO.HHZ. 2021-09-18T23:31:12.72 0.1 undecidable manual P 322 27.75 97 -0.17 95
IV.ATFO.HHZ. 2021-09-18T23:31:11.44 0.1 undecidable manual P 254 18.6702 106 -0.08 99
IV.SNTG.HHZ. 2021-09-18T23:31:11.94 1.0 undecidable manual P 146 21.2676 103 0.04 25
IV.ARVD.HHZ. 2021-09-18T23:31:11.10 0.1 undecidable manual P 52 15.0738 115 0.1 100
IV.FRON.EHZ. 2021-09-18T23:31:10.66 0.3 undecidable manual P 334 12.7761 122 -0.03 76
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FRON.EHE. ML:0.5 0.000028 0.12 AML other m 2021-09-18T23:31:13.25
IV.FRON.EHN. ML:0.6 0.00003905 0.18 AML other m 2021-09-18T23:31:13.79
IV.ARVD.HHE. ML:0.4 0.00002225 0.22 AML other m 2021-09-18T23:31:14.19
IV.ARVD.HHN. ML:0.4 0.0000222 1.54 AML other m 2021-09-18T23:31:14.22
IV.SNTG.HHE. ML:0.6 0.00002625 0.08 AML other m 2021-09-18T23:31:15.59
IV.SNTG.HHN. ML:0.7 0.0000283 0.4 AML other m 2021-09-18T23:31:16.00
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