Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.9 on date 23-10-2021 and time 01:05:14 (UTC) in region 4 km SW Frontone (PU)

A magnitude ML 0.9 earthquake occured in region: 4 km SW Frontone (PU), on

  • 23-10-2021 01:05:14 (UTC)
  • 23-10-2021 03:05:14 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4880, 12.7030 at 15 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
Frontone PU 4 1300 1300
Serra Sant'Abbondio PU 6 1027 2327
Cantiano PU 6 2245 4572
Cagli PU 8 8731 13303
Scheggia e Pascelupo PG 10 1393 14696
Pergola PU 14 6333 21029
Sassoferrato AN 14 7285 28314
Costacciaro PG 14 1216 29530
Acqualagna PU 15 4393 33923
Sigillo PG 18 2404 36327
Gubbio PG 18 32216 68543
Piobbico PU 19 2029 70572
Arcevia AN 19 4612 75184
Genga AN 20 1797 76981

Municipalities with at least 50000 inhabitants

An earthquake occurred to
47 Km SW of Fano (60888 inhabitants)
49 Km NE of Perugia (166134 inhabitants)
50 Km SW of Pesaro (94582 inhabitants)
59 Km N of Foligno (57155 inhabitants)
65 Km S of Rimini (147750 inhabitants)
66 Km E of Arezzo (99543 inhabitants)
67 Km W of Ancona (100861 inhabitants)
81 Km SE of Cesena (96758 inhabitants)
98 Km SE of Forlì (117913 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 0.9 2021-10-23
01:05:14		 43.4875 12.7033 15 2021-10-23
01:12:26		 Sala Sismica INGV-Roma 96893941
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-10-23 01:05:14 ± 0.07
Latitude 43.4875 ± 0.0027
Longitude 12.7033 ± 0.0025
Depth (km) 15 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 96893941

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 233
Semi-minor axis of confidence ellipse (meter) 150
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 222
Circular confidence region, given by single value of horizontal uncertainty (meter) 230.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 74
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.08
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.25900
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 9
Magnitude information

ML:0.9

Field Value
Value 0.9
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 96893941
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-10-23 01:12:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.FOSV.EHZ. 2021-10-23T01:05:23.38 0.6 undecidable manual S 168 21.867 111 -0.09 50
IV.NARO.HHZ. 2021-10-23T01:05:22.25 0.6 undecidable manual S 324 16.872 120 -0.01 50
IV.MPAG.EHZ. 2021-10-23T01:05:22.37 0.6 undecidable manual S 16 16.3725 122 0.23 49
IV.ATFO.HHZ. 2021-10-23T01:05:22.45 0.6 undecidable manual S 218 17.0718 120 0.13 49
IV.ARVD.HHZ. 2021-10-23T01:05:22.83 0.6 undecidable manual S 86 19.1697 116 0.02 50
IV.ATCC.EHZ. 2021-10-23T01:05:21.73 3.0 undecidable manual P -0.11 0
IV.MURB.HHZ. 2021-10-23T01:05:21.07 0.6 negative manual P 210 28.749 104 0.19 48
IV.COR1.EHZ. 2021-10-23T01:05:21.80 3.0 negative manual P 0.53 0
IV.PIEI.HHZ. 2021-10-23T01:05:21.66 0.6 undecidable manual S 292 14.5743 126 -0.09 50
IV.SSFR.HHZ. 2021-10-23T01:05:20.62 0.6 undecidable manual S 132 8.4804 144 0.02 51
IV.ATPI.EHZ. 2021-10-23T01:05:20.51 3.0 undecidable manual P 0.16 0
IV.ATFO.HHZ. 2021-10-23T01:05:19.27 0.1 undecidable manual P 218 17.0718 120 0.07 100
IV.ARVD.HHZ. 2021-10-23T01:05:19.39 0.6 positive manual P 86 19.1697 116 -0.1 49
IV.FRON.EHZ. 2021-10-23T01:05:19.92 0.6 undecidable manual S 28 3.7962 163 -0.12 51
IV.NARO.HHZ. 2021-10-23T01:05:19.10 0.6 undecidable manual P 324 16.872 120 -0.07 50
IV.FOSV.EHZ. 2021-10-23T01:05:19.75 0.3 positive manual P 168 21.867 111 -0.12 74
IV.MPAG.EHZ. 2021-10-23T01:05:19.19 0.6 positive manual P 16 16.3725 122 0.09 50
IV.SSFR.HHZ. 2021-10-23T01:05:18.17 1.0 undecidable manual P 132 8.4804 144 -0.04 26
IV.PIEI.HHZ. 2021-10-23T01:05:18.80 0.1 negative manual P 292 14.5743 126 -0.07 100
IV.FRON.EHZ. 2021-10-23T01:05:17.90 0.3 undecidable manual P 28 3.7962 163 0.01 78
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FRON.EHE. ML:0.8 0.00007555000000000001 1.68 AML other m 2021-10-23T01:05:19.96
IV.SSFR.HHN. ML:1.2 0.000167 0.12 AML other m 2021-10-23T01:05:20.92
IV.FRON.EHN. ML:0.8 0.0000678 0.5 AML other m 2021-10-23T01:05:20.98
IV.SSFR.HHE. ML:1.2 0.0001725 1.24 AML other m 2021-10-23T01:05:21.68
IV.PIEI.HHN. ML:0.8 0.0000523 0.22 AML other m 2021-10-23T01:05:21.85
IV.PIEI.HHE. ML:1.1 0.00009984999999999999 0.1 AML other m 2021-10-23T01:05:21.93
IV.NARO.HHN. ML:1.1 0.00009355 0.06 AML other m 2021-10-23T01:05:22.30
IV.ATFO.HHN. ML:1.1 0.0000872 0.24 AML other m 2021-10-23T01:05:22.60
IV.MPAG.EHN. ML:0.7 0.000034750000000000004 0.36 AML other m 2021-10-23T01:05:22.51
IV.MPAG.EHE. ML:0.7 0.00003565 0.26 AML other m 2021-10-23T01:05:22.47
IV.NARO.HHE. ML:1.1 0.00009075 0.96 AML other m 2021-10-23T01:05:22.42
IV.ATFO.HHE. ML:1.0 0.00007769999999999999 0.58 AML other m 2021-10-23T01:05:23.51
IV.ARVD.HHN. ML:0.7 0.000028999999999999997 1.08 AML other m 2021-10-23T01:05:23.28
IV.FOSV.EHE. ML:0.7 0.0000322 0.3 AML other m 2021-10-23T01:05:23.58
IV.FOSV.EHN. ML:1.0 0.00005695 0.44 AML other m 2021-10-23T01:05:23.50
IV.ARVD.HHE. ML:0.7 0.000029999999999999997 1.4 AML other m 2021-10-23T01:05:23.24
IV.MURB.HHN. ML:1.1 0.00005645 0.28 AML other m 2021-10-23T01:05:26.24
IV.MURB.HHE. ML:1.0 0.000052449999999999994 0.54 AML other m 2021-10-23T01:05:28.31
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