Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 20-04-2021 and time 02:12:25 (Italy) in region 2 km W San Marco dei Cavoti (BN)

A magnitude ML 1.6 earthquake occured in region: 2 km W San Marco dei Cavoti (BN), on

  • 20-04-2021 00:12:25 (UTC)
  • 20-04-2021 02:12:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.3080, 14.8590 at 22 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
San Marco dei Cavoti BN 2 3371 3371
Reino BN 3 1210 4581
Molinara BN 5 1618 6199
San Giorgio La Molara BN 6 2994 9193
Colle Sannita BN 7 2431 11624
Pago Veiano BN 7 2406 14030
Circello BN 7 2388 16418
Fragneto l'Abate BN 9 1049 17467
Pesco Sannita BN 9 1972 19439
Fragneto Monforte BN 10 1840 21279
Foiano di Val Fortore BN 11 1410 22689
Campolattaro BN 11 1072 23761
Castelpagano BN 12 1483 25244
Pietrelcina BN 12 3114 28358
Montefalcone di Val Fortore BN 13 1525 29883
Santa Croce del Sannio BN 14 927 30810
Buonalbergo BN 14 1730 32540
Baselice BN 14 2397 34937
Pontelandolfo BN 14 2167 37104
Casalduni BN 15 1378 38482
Casalbore AV 15 1800 40282
Paduli BN 16 3978 44260
Ginestra degli Schiavoni BN 16 476 44736
Castelvetere in Val Fortore BN 17 1240 45976
Morcone BN 17 4932 50908
Sant'Arcangelo Trimonte BN 17 573 51481
San Bartolomeo in Galdo BN 17 4867 56348
Ponte BN 18 2580 58928
Sassinoro BN 18 618 59546
Castelfranco in Miscano BN 19 916 60462
Montecalvo Irpino AV 19 3725 64187
San Lupo BN 19 801 64988
Torrecuso BN 20 3407 68395
Riccia CB 20 5262 73657

Municipalities with at least 50000 inhabitants

An earthquake occurred to
21 Km NE of Benevento (60091 inhabitants)
44 Km N of Avellino (54857 inhabitants)
51 Km NE of Caserta (76326 inhabitants)
57 Km NE of Acerra (59573 inhabitants)
60 Km W of Foggia (151991 inhabitants)
61 Km SW of San Severo (53905 inhabitants)
63 Km NE of Afragola (65057 inhabitants)
65 Km NE of Casoria (77642 inhabitants)
66 Km NE of Aversa (53047 inhabitants)
68 Km NE of Scafati (50787 inhabitants)
68 Km NE of Portici (55274 inhabitants)
69 Km N of Cava de' Tirreni (53659 inhabitants)
69 Km NE of Giugliano in Campania (122974 inhabitants)
70 Km NE of Ercolano (53709 inhabitants)
70 Km N of Salerno (135261 inhabitants)
71 Km NE of Torre del Greco (86275 inhabitants)
72 Km NE of Marano di Napoli (59874 inhabitants)
73 Km NE of Napoli (974074 inhabitants)
75 Km NE of Castellammare di Stabia (66466 inhabitants)
79 Km N of Battipaglia (50786 inhabitants)
82 Km NE of Pozzuoli (81661 inhabitants)
88 Km W of Cerignola (58396 inhabitants)
95 Km W of Manfredonia (57279 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 1.6 2021-04-20
00:12:25		 41.3078 14.8587 22 2021-07-12
16:55:15		 Bollettino Sismico Italiano INGV 91332761
Reviewed
Rev100 		ML 1.6 2021-04-20
00:12:25		 41.3192 14.8717 20 2021-04-20
00:24:23		 Sala Sismica INGV-Roma 89276861
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-20 00:12:25 ± 0.07
Latitude 41.3078 ± 0.0045
Longitude 14.8587 ± 0.0072
Depth (km) 22 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 91332761

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 471
Semi-minor axis of confidence ellipse (meter) 453
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 54
Circular confidence region, given by single value of horizontal uncertainty (meter) 470.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 58
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) 0.2
Epicentral distance of station closest to the epicenter (degree) 0.09173
Epicentral distance of station farthest from the epicenter (degree) 0.79860
Number of stations at which the event was observed 17
Number of stations from which data was used for origin computation 17
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 91332761
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-06-15 13:45:10

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 16
Type of magnitude ML
Reference to an origin 89276861
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-20 00:24:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.SGRT.HHZ. 2021-04-20T00:12:41.08 0.1 undecidable manual P 56 88.6446 98 0.18 93
IV.BSSO.HHZ. 2021-04-20T00:12:38.05 0.3 undecidable manual S 320 34.4433 115 0.05 79
IV.PAOL.HHN. 2021-04-20T00:12:38.79 0.3 undecidable manual S 218 39.1275 111 -0.37 74
IV.PTRJ.HNN. 2021-04-20T00:12:36.46 0.6 undecidable manual S 283 28.1496 120 -0.06 53
IV.PIGN.HHZ. 2021-04-20T00:12:36.37 0.1 undecidable manual P 258 57.8976 103 0.14 99
IV.TRIV.HHN. 2021-04-20T00:12:36.25 0.3 undecidable manual P 333 56.9985 104 0.15 75
IV.VITU.HHZ. 2021-04-20T00:12:35.93 0.6 undecidable manual S 234 23.5542 126 0.45 49
IV.SNAL.HNZ. 2021-04-20T00:12:35.14 0.1 undecidable manual P 145 51.5151 105 -0.15 100
IV.MRB1.HHZ. 2021-04-20T00:12:35.55 0.6 undecidable manual S 156 22.4553 128 0.29 51
IV.MELA.HHZ. 2021-04-20T00:12:34.47 0.3 undecidable manual P 27 49.5171 106 -0.51 68
IV.CAFE.HHE. 2021-04-20T00:12:34.03 0.6 undecidable manual P 134 44.2224 108 -0.19 50
IV.SGTA.HHE. 2021-04-20T00:12:34.67 0.6 undecidable manual P 114 46.4202 107 0.14 51
IX.SSB3.HHN.02 2021-04-20T00:12:33.83 0.3 undecidable manual P 129 40.0266 111 0.22 75
IV.PAOL.HHN. 2021-04-20T00:12:33.42 0.6 undecidable manual P 218 39.1275 111 -0.06 52
IV.PSB1.HNE. 2021-04-20T00:12:33.11 0.3 undecidable manual S 203 10.1787 152 0.01 82
IV.CIGN.HHE. 2021-04-20T00:12:33.72 0.6 undecidable manual P 6 38.628 112 0.32 50
IV.SACR.HHZ. 2021-04-20T00:12:33.69 0.6 undecidable manual S 308 16.1727 138 -0.33 51
IV.SGG.HHZ. 2021-04-20T00:12:33.99 0.3 undecidable manual P 283 40.9257 110 0.26 74
IV.BSSO.HHZ. 2021-04-20T00:12:32.75 0.3 undecidable manual P 320 34.4433 115 -0.05 78
IV.MRB1.HHZ. 2021-04-20T00:12:31.15 0.3 undecidable manual P 156 22.4553 128 -0.07 80
IV.VITU.HHZ. 2021-04-20T00:12:31.55 0.3 undecidable manual P 234 23.5542 126 0.2 77
IV.PTRJ.HNN. 2021-04-20T00:12:31.82 0.3 undecidable manual P 283 28.1496 120 -0.13 79
IV.SACR.HHZ. 2021-04-20T00:12:30.28 0.3 undecidable manual P 308 16.1727 138 -0.22 78
IV.PSB1.HNE. 2021-04-20T00:12:29.69 0.6 undecidable manual P 203 10.1787 152 -0.28 52
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SACR.HNE. ML:1.6 0.00024891724999999995 0.22 AML other m 2021-04-20T00:12:34.29
IV.SACR.HHE. ML:1.6 0.000247616 0.22 AML other m 2021-04-20T00:12:34.29
IV.SACR.HNN. ML:1.4 0.00016467985 0.34 AML other m 2021-04-20T00:12:35.22
IV.SACR.HHN. ML:1.4 0.00016262594999999998 1.68 AML other m 2021-04-20T00:12:36.11
IV.VITU.HHN. ML:1.7 0.000255 0.78 AML other m 2021-04-20T00:12:37.50
IV.VITU.HHE. ML:1.5 0.000161 0.74 AML other m 2021-04-20T00:12:37.22
IV.VITU.HNN. ML:1.7 0.000237114125 0.18 AML other m 2021-04-20T00:12:37.80
IV.MRB1.HHN. ML:1.7 0.00022914345 0.62 AML other m 2021-04-20T00:12:38.07
IV.MRB1.HHE. ML:1.6 0.00018313620000000002 0.64 AML other m 2021-04-20T00:12:43.79
IV.SGG.HHN. ML:1.3 0.000055668755 0.46 AML other m 2021-04-20T00:12:44.20
IV.PIGN.HHN. ML:1.6 0.0000798703 0.46 AML other m 2021-04-20T00:12:48.73
IV.PIGN.HHE. ML:1.5 0.00005813375499999999 0.46 AML other m 2021-04-20T00:12:50.17
IV.SGG.HHE. ML:1.3 0.000055234425 0.46 AML other m 2021-04-20T00:12:52.49
IV.MELA.HHE. ML:1.6 0.00010489598999999999 1.36 AML other m 2021-04-20T00:12:53.16
IV.SGRT.HHN. ML:1.8 0.00007714272 0.3 AML other m 2021-04-20T00:12:54.49
IV.SGRT.HHE. ML:1.8 0.000079892315 0.64 AML other m 2021-04-20T00:12:54.37
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