Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.4 on date 08-04-2021 and time 23:45:36 (UTC) in region 5 km S Serra Sant'Abbondio (PU)

A magnitude ML 0.4 earthquake occured in region: 5 km S Serra Sant'Abbondio (PU), on

  • 08-04-2021 23:45:36 (UTC)
  • 09-04-2021 01:45:36 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4470, 12.7680 at 14 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
Serra Sant'Abbondio PU 5 1027 1027
Sassoferrato AN 8 7285 8312
Frontone PU 8 1300 9612
Scheggia e Pascelupo PG 9 1393 11005
Costacciaro PG 11 1216 12221
Cantiano PU 12 2245 14466
Sigillo PG 13 2404 16870
Genga AN 14 1797 18667
Pergola PU 14 6333 25000
Cagli PU 15 8731 33731
Arcevia AN 15 4612 38343
Fabriano AN 17 31480 69823
Fossato di Vico PG 17 2840 72663
Gubbio PG 18 32216 104879

Municipalities with at least 50000 inhabitants

An earthquake occurred to
49 Km NE of Perugia (166134 inhabitants)
49 Km SW of Fano (60888 inhabitants)
53 Km S of Pesaro (94582 inhabitants)
55 Km N of Foligno (57155 inhabitants)
64 Km W of Ancona (100861 inhabitants)
70 Km S of Rimini (147750 inhabitants)
71 Km E of Arezzo (99543 inhabitants)
88 Km SE of Cesena (96758 inhabitants)
99 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 0.4 2021-04-08
23:45:36		 43.4468 12.7678 14 2021-04-08
23:59:38		 Sala Sismica INGV-Roma 88924631
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-08 23:45:36 ± 0.06
Latitude 43.4468 ± 0.0027
Longitude 12.7678 ± 0.0037
Depth (km) 14 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 88924631

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 316
Semi-minor axis of confidence ellipse (meter) 101
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 242
Circular confidence region, given by single value of horizontal uncertainty (meter) 320.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 70
Number of associated phases, regardless of their use for origin computation 34
Number of defining phases 24
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.11
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.47124
Number of stations at which the event was observed 26
Number of stations from which data was used for origin computation 17
Magnitude information

ML:0.4

Field Value
Value 0.4
Uncertainty 0.3
Num. used stations 16
Type of magnitude ML
Reference to an origin 88924631
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-08 23:59:38
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.IACL.HHZ. 2021-04-08T23:47:05.76 3.0 undecidable manual Sn 2.67 0
HL.VLS.HHZ. 2021-04-08T23:46:49.33 3.0 negative manual Pn -0.12 0
IV.MTGR.HHZ. 2021-04-08T23:46:27.55 3.0 negative manual Pn 9.38 0
IV.MILZ.HHZ. 2021-04-08T23:46:16.25 3.0 negative manual Pn -0.12 0
IT.RMMM.HGZ. 2021-04-08T23:46:06.15 3.0 undecidable manual Sn -0.87 0
IV.CADC.EHZ. 2021-04-08T23:46:05.12 3.0 positive manual Pn -1.19 0
OT.OT13.EHZ. 2021-04-08T23:45:49.32 3.0 negative manual Pn -0.99 0
IV.SEI.HHZ. 2021-04-08T23:45:48.29 3.0 negative manual Pn -0.22 0
IV.FDMO.HHZ. 2021-04-08T23:45:45.63 1.0 undecidable manual P 150 52.3032 94 -0.27 29
IV.PIEI.HHZ. 2021-04-08T23:45:44.35 0.3 undecidable manual S 298 21.1677 106 -0.26 92
IV.MPAG.EHZ. 2021-04-08T23:45:44.48 0.6 undecidable manual S 358 20.2686 107 0.1 64
IV.FOSV.EHZ. 2021-04-08T23:45:43.38 0.6 undecidable manual S 182 16.872 113 -0.14 64
IV.PE3.EHZ. 2021-04-08T23:45:43.25 1.0 undecidable manual P 322 35.2425 96 -0.03 32
IV.ARVD.HHZ. 2021-04-08T23:45:43.16 0.3 undecidable manual S 68 15.0738 118 0.06 98
IV.ATLO.EHE. 2021-04-08T23:45:42.85 1.0 undecidable manual P 243 32.5452 97 -0.01 32
IV.TB02.DHZ.01 2021-04-08T23:45:42.92 0.6 undecidable manual P 254 30.1476 98 0.43 58
IV.MURB.HHE. 2021-04-08T23:45:42.36 1.0 undecidable manual P 224 28.3494 99 0.14 31
IV.ATCC.EHZ. 2021-04-08T23:45:42.59 0.6 undecidable manual P 200 30.8469 98 -0.01 64
IV.APEC.HHE. 2021-04-08T23:45:42.75 1.0 undecidable manual P 294 30.6471 98 0.18 31
IV.NARO.HHZ. 2021-04-08T23:45:41.43 0.3 undecidable manual P 320 23.6541 103 -0.08 95
IV.SSFR.HHE. 2021-04-08T23:45:41.00 0.3 undecidable manual S 135 1.5984 172 0.05 100
IV.FRON.EHZ. 2021-04-08T23:45:41.65 0.6 undecidable manual S 337 8.5803 139 -0.08 65
IV.ATPC.HHZ. 2021-04-08T23:45:41.77 0.6 undecidable manual P 279 25.3524 101 0.01 64
IV.PIEI.HHZ. 2021-04-08T23:45:41.00 1.0 undecidable manual P 298 21.1677 106 -0.14 32
IV.ATBU.EHZ. 2021-04-08T23:45:41.13 1.0 undecidable manual P 280 17.9709 111 0.46 30
IV.MPAG.EHZ. 2021-04-08T23:45:41.02 1.0 positive manual P 358 20.2686 107 0.02 33
IV.ATSC.EHE. 2021-04-08T23:45:41.44 0.6 undecidable manual S 249 6.993 146 -0.04 66
IV.ARVD.HHZ. 2021-04-08T23:45:40.29 1.0 undecidable manual P 68 15.0738 118 0.02 33
IV.FOSV.EHZ. 2021-04-08T23:45:40.40 0.3 positive manual P 182 16.872 113 -0.12 96
IV.ATSC.EHE. 2021-04-08T23:45:39.34 0.6 undecidable manual P 249 6.993 146 0.01 66
IV.SSFR.HHE. 2021-04-08T23:45:39.08 0.3 undecidable manual P 135 1.5984 172 0.05 100
IV.FRON.EHZ. 2021-04-08T23:45:39.58 0.6 positive manual P 337 8.5803 139 0.1 65
IT.RMMM.HGZ. 2021-04-08T23:45:39.92 3.0 negative manual Pn 0.35 0
IV.RM33.HNZ. 2021-04-08T23:45:37.30 3.0 positive manual P 0.05 0
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FRON.EHE. ML:0.1 0.000016728921 0.1024 AML other m 2021-04-08T23:45:41.79
IV.ARVD.HHN. ML:0.4 0.000022334735 0.0768 AML other m 2021-04-08T23:45:43.42
IV.ARVD.HHE. ML:0.3 0.00001685 0.16 AML other m 2021-04-08T23:45:43.61
IV.MPAG.HNE. ML:1.6 0.00027749679999999996 1.0496 AML other m 2021-04-08T23:45:45.04
IV.MPAG.HNN. ML:1.8 0.00041914557999999996 1.1136 AML other m 2021-04-08T23:45:45.00
IV.FRON.EHN. ML:0.3 0.0000184511225 0.0512 AML other m 2021-04-08T23:45:42.06
IV.FOSV.EHE. ML:0.1 0.000011088931 0.0512 AML other m 2021-04-08T23:45:43.57
IV.FOSV.EHN. ML:0.3 0.000016405570000000002 0.2688 AML other m 2021-04-08T23:45:43.46
IV.PIEI.HHE. ML:0.2 0.000012259759499999998 0.1664 AML other m 2021-04-08T23:45:44.99
IV.PIEI.HHN. ML:0.2 0.000008109831000000001 0.0896 AML other m 2021-04-08T23:45:44.76
IV.MPAG.EHE. ML:0.2 0.000012295395 0.0768 AML other m 2021-04-08T23:45:44.60
IV.MPAG.EHN. ML:0.4 0.000017256795 0.896 AML other m 2021-04-08T23:45:44.68
IV.NARO.HHE. ML:0.4 0.000014183159000000001 0.064 AML other m 2021-04-08T23:45:45.43
IV.NARO.HHN. ML:0.4 0.000012661895 0.6528 AML other m 2021-04-08T23:45:45.46
IV.ATCC.EHE. ML:0.6 0.000021521390000000003 1.6896 AML other m 2021-04-08T23:46:12.00
IV.ATCC.EHN. ML:0.6 0.000020885175 1.5744 AML other m 2021-04-08T23:46:21.07
IV.MILZ.HHE. ML:0.0 0.0003063726 0.1152 AML other m 2021-04-08T23:46:31.42
IV.MILZ.HHN. ML:0.0 0.0002680778 0.1152 AML other m 2021-04-08T23:46:18.80
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