Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 0.8 on date 18-04-2021 and time 02:35:34 (UTC) in region 2 km W Serra San Quirico (AN)

A magnitude ML 0.8 earthquake occured in region: 2 km W Serra San Quirico (AN), on

  • 18-04-2021 02:35:34 (UTC)
  • 18-04-2021 04:35:34 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 43.4460, 12.9860 at 24 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

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 San Quirico AN 2 2850 2850
Genga AN 4 1797 4647
Mergo AN 5 1037 5684
Arcevia AN 7 4612 10296
Rosora AN 8 1985 12281
Castelplanio AN 10 3540 15821
Sassoferrato AN 10 7285 23106
Poggio San Marcello AN 11 693 23799
Cupramontana AN 11 4756 28555
Poggio San Vicino MC 11 246 28801
Montecarotto AN 11 1987 30788
Maiolati Spontini AN 11 6248 37036
Serra de' Conti AN 12 3746 40782
Monte Roberto AN 13 3061 43843
Apiro MC 13 2280 46123
Fabriano AN 14 31480 77603
Castelbellino AN 14 4947 82550
Cerreto d'Esi AN 14 3817 86367
San Paolo di Jesi AN 15 933 87300
Barbara AN 15 1368 88668
Staffolo AN 16 2253 90921
Pergola PU 18 6333 97254
San Lorenzo in Campo PU 18 3414 100668
Serra Sant'Abbondio PU 18 1027 101695
Castelleone di Suasa AN 18 1676 103371
Ostra Vetere AN 19 3311 106682

Municipalities with at least 50000 inhabitants

An earthquake occurred to
44 Km S of Fano (60888 inhabitants)
47 Km W of Ancona (100861 inhabitants)
52 Km S of Pesaro (94582 inhabitants)
59 Km NE of Foligno (57155 inhabitants)
61 Km NE of Perugia (166134 inhabitants)
76 Km SE of Rimini (147750 inhabitants)
89 Km E of Arezzo (99543 inhabitants)
97 Km SE of Cesena (96758 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
Bulletin
Rev1000 		ML 0.8 2021-04-18
02:35:34		 43.4458 12.9863 24 2021-07-12
16:55:10		 Bollettino Sismico Italiano INGV 90055371
Reviewed
Rev100 		ML 0.8 2021-04-18
02:35:34		 43.4447 12.9883 23 2021-04-18
02:48:12		 Sala Sismica INGV-Roma 89197621
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-18 02:35:34 ± 0.09
Latitude 43.4458 ± 0.0027
Longitude 12.9863 ± 0.0037
Depth (km) 24 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 90055371

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 350
Semi-minor axis of confidence ellipse (meter) 34
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 57
Circular confidence region, given by single value of horizontal uncertainty (meter) 350.0
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 31
Number of defining phases 31
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.15
Epicentral distance of station closest to the epicenter (degree) 0.06115
Epicentral distance of station farthest from the epicenter (degree) 0.45865
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 16
Magnitudes information

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 90055371
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-05-13 15:02:13

ML:0.8

Field Value
Value 0.8
Uncertainty 0.2
Num. used stations 9
Type of magnitude ML
Reference to an origin 89197621
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-18 02:48:12
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CSP1.EHZ. 2021-04-18T02:35:49.58 0.3 undecidable manual S 156 43.0236 112 0.17 70
IV.ATCC.EHZ. 2021-04-18T02:35:48.84 0.3 undecidable manual S 224 40.2264 113 0.13 72
IV.MML1.HNE. 2021-04-18T02:35:48.16 0.3 undecidable manual S 182 36.8298 116 0.26 70
IV.NARO.HHZ. 2021-04-18T02:35:48.21 0.3 undecidable manual S 299 37.4292 115 0.18 71
IV.PIEI.HHZ. 2021-04-18T02:35:48.18 0.3 undecidable manual S 285 37.629 115 0.09 73
IV.FOSV.EHZ. 2021-04-18T02:35:45.24 0.6 undecidable manual S 227 24.753 128 0.11 49
IV.MPAG.HNZ. 2021-04-18T02:35:45.76 0.3 undecidable manual S 318 27.3504 125 0.07 74
IV.ATSC.EHZ. 2021-04-18T02:35:45.13 0.3 undecidable manual S 264 24.2535 128 0.09 74
IV.SNTG.HHZ. 2021-04-18T02:35:44.51 0.3 undecidable manual S 190 21.4674 132 0.04 75
IV.FRON.EHZ. 2021-04-18T02:35:44.80 0.3 undecidable manual S 291 22.4553 131 0.14 74
IV.COR1.EHZ. 2021-04-18T02:35:44.73 0.3 undecidable manual S 3 20.6682 134 0.42 69
IV.AOI.HHE. 2021-04-18T02:35:44.40 0.6 undecidable manual P 77 50.9157 108 0.03 47
IV.SSFR.HNZ. 2021-04-18T02:35:43.56 0.3 undecidable manual S 266 16.4724 141 0.01 76
IV.EL6.EHZ. 2021-04-18T02:35:43.65 0.3 undecidable manual S 144 15.873 142 0.2 73
IV.CSP1.EHZ. 2021-04-18T02:35:43.32 0.3 undecidable manual P 156 43.0236 112 0.09 71
IV.CING.HNZ. 2021-04-18T02:35:43.76 0.3 undecidable manual S 115 18.5703 137 -0.15 74
IV.PIEI.HHZ. 2021-04-18T02:35:42.34 0.3 undecidable manual P 285 37.629 115 -0.13 71
IV.ATCC.EHZ. 2021-04-18T02:35:42.83 0.3 undecidable manual P 224 40.2264 113 0 73
IV.MML1.HNE. 2021-04-18T02:35:42.30 0.3 undecidable manual P 182 36.8298 116 -0.06 73
IV.NARO.HHZ. 2021-04-18T02:35:42.34 0.3 undecidable manual P 299 37.4292 115 -0.1 72
IV.ARVD.HHZ. 2021-04-18T02:35:41.97 0.3 undecidable manual S 328 6.7932 162 -0.33 72
IV.MPAG.HNZ. 2021-04-18T02:35:41.04 0.3 undecidable manual P 318 27.3504 125 -0.05 74
IV.COR1.EHZ. 2021-04-18T02:35:40.50 0.3 undecidable manual P 3 20.6682 134 0.21 72
IV.FOSV.EHZ. 2021-04-18T02:35:40.81 0.3 undecidable manual P 227 24.753 128 0.05 75
IV.FRON.EHZ. 2021-04-18T02:35:40.41 0.1 undecidable manual P 291 22.4553 131 -0.08 99
IV.ATSC.EHZ. 2021-04-18T02:35:40.56 0.3 undecidable manual P 264 24.2535 128 -0.15 73
IV.CING.HNZ. 2021-04-18T02:35:39.92 0.1 undecidable manual P 115 18.5703 137 -0.14 99
IV.SNTG.HHZ. 2021-04-18T02:35:39.94 0.3 undecidable manual P 190 21.4674 132 -0.44 69
IV.SSFR.HNZ. 2021-04-18T02:35:39.74 0.3 undecidable manual P 266 16.4724 141 -0.11 74
IV.EL6.EHZ. 2021-04-18T02:35:39.69 0.1 undecidable manual P 144 15.873 142 -0.1 100
IV.ARVD.HHZ. 2021-04-18T02:35:38.93 0.3 undecidable manual P 328 6.7932 162 -0.2 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.ARVD.HHE. ML:0.9 0.0000492859 0.2016 AML other m 2021-04-18T02:35:42.00
IV.ARVD.HHN. ML:0.8 0.0000387072965 0.12 AML other m 2021-04-18T02:35:42.48
IV.FRON.EHE. ML:0.7 0.000025573865 0.1008 AML other m 2021-04-18T02:35:45.07
IV.FRON.EHN. ML:1.0 0.000051980105 0.1408 AML other m 2021-04-18T02:35:45.22
IV.FOSV.EHE. ML:0.5 0.00001500543 0.0992 AML other m 2021-04-18T02:35:46.10
IV.NARO.HHE. ML:0.9 0.000024873535 0.1984 AML other m 2021-04-18T02:35:48.64
IV.NARO.HHN. ML:0.8 0.000020574074000000002 0.0992 AML other m 2021-04-18T02:35:48.63
IV.PIEI.HHE. ML:0.8 0.000018958465 0.08 AML other m 2021-04-18T02:35:49.03
IV.ATCC.EHE. ML:1.0 0.000030317225000000003 0.28 AML other m 2021-04-18T02:35:49.67
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