Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.4 on date 13-04-2021 and time 01:44:44 (Italy) in region 2 km E San Gregorio Magno (SA)

A magnitude ML 1.4 earthquake occured in region: 2 km E San Gregorio Magno (SA), on

  • 12-04-2021 23:44:44 (UTC)
  • 13-04-2021 01:44:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.6640, 15.4220 at 18 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 Gregorio Magno SA 2 4286 4286
Romagnano al Monte SA 4 368 4654
Ricigliano SA 5 1144 5798
Buccino SA 6 5047 10845
Balvano PZ 8 1830 12675
Salvitelle SA 9 560 13235
Vietri di Potenza PZ 10 2832 16067
Palomonte SA 11 3985 20052
Muro Lucano PZ 11 5497 25549
Auletta SA 12 2336 27885
Caggiano SA 12 2765 30650
Colliano SA 13 3638 34288
Pertosa SA 14 690 34978
Castelgrande PZ 14 943 35921
Bella PZ 15 5171 41092
Baragiano PZ 15 2671 43763
Savoia di Lucania PZ 15 1127 44890
Sicignano degli Alburni SA 15 3519 48409
Petina SA 15 1159 49568
Contursi Terme SA 15 3394 52962
Valva SA 15 1643 54605
Oliveto Citra SA 16 3802 58407
Laviano SA 17 1438 59845
Sant'Angelo Le Fratte PZ 17 1429 61274
Polla SA 18 5279 66553
Santomenna SA 18 443 66996
Picerno PZ 18 5985 72981
Castelnuovo di Conza SA 19 619 73600
Pescopagano PZ 19 1910 75510
Postiglione SA 20 2151 77661
San Fele PZ 20 3004 80665

Municipalities with at least 50000 inhabitants

An earthquake occurred to
33 Km W of Potenza (67122 inhabitants)
38 Km E of Battipaglia (50786 inhabitants)
56 Km E of Salerno (135261 inhabitants)
60 Km E of Avellino (54857 inhabitants)
61 Km E of Cava de' Tirreni (53659 inhabitants)
75 Km SE of Benevento (60091 inhabitants)
76 Km E of Scafati (50787 inhabitants)
78 Km SW of Cerignola (58396 inhabitants)
79 Km E of Castellammare di Stabia (66466 inhabitants)
90 Km S of Foggia (151991 inhabitants)
90 Km E of Torre del Greco (86275 inhabitants)
92 Km E of Portici (55274 inhabitants)
92 Km E of Ercolano (53709 inhabitants)
94 Km E of Acerra (59573 inhabitants)
97 Km SW of Andria (100440 inhabitants)
97 Km W of Altamura (70396 inhabitants)
98 Km E of Afragola (65057 inhabitants)
99 Km E of Casoria (77642 inhabitants)
99 Km W of Matera (60436 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 1.4 2021-04-12
23:44:44		 40.6638 15.4223 18 2021-07-12
16:55:08		 Bollettino Sismico Italiano INGV 89397971
Reviewed
Rev100 		ML 1.5 2021-04-12
23:44:44		 40.6758 15.4072 21 2021-04-12
23:53:36		 Sala Sismica INGV-Roma 89046761
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-04-12 23:44:44 ± 0.18
Latitude 40.6638 ± 0.0063
Longitude 15.4223 ± 0.0107
Depth (km) 18 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 89397971

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 946
Semi-minor axis of confidence ellipse (meter) 222
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 287
Circular confidence region, given by single value of horizontal uncertainty (meter) 950.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 76
Number of associated phases, regardless of their use for origin computation 25
Number of defining phases 21
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.27
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.49373
Number of stations at which the event was observed 16
Number of stations from which data was used for origin computation 12
Magnitudes information

ML:1.5

Field Value
Value 1.5
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 89046761
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-04-12 23:53:36

ML:1.4

Field Value
Value 1.4
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 89397971
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-04-29 15:30:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.GAVE.EHZ. 2021-04-12T23:45:40.57 3.0 undecidable manual Sn -3.02 0
IV.CPGN.EHZ. 2021-04-12T23:45:29.40 3.0 undecidable manual Pn -0.51 0
IV.APEC.HHZ. 2021-04-12T23:45:26.06 3.0 negative manual Pn -0.63 0
IV.CMPR.HHZ. 2021-04-12T23:44:58.20 0.6 undecidable manual S 195 39.627 105 0.36 45
IV.PALZ.HHZ. 2021-04-12T23:44:54.25 0.6 undecidable manual P 55 54.8007 100 -0.27 46
IV.CDRU.HHZ. 2021-04-12T23:44:53.39 0.6 undecidable manual S 207 21.7671 121 0 50
IX.SRN3.HNZ.02 2021-04-12T23:44:53.26 0.6 undecidable manual S 171 19.9689 124 0.27 48
IX.SNR3.HHE.02 2021-04-12T23:44:53.67 0.6 undecidable manual S 293 20.868 122 0.47 46
IX.CGG3.HNN.01 2021-04-12T23:44:52.31 0.6 undecidable manual S 148 15.9729 131 0.17 50
IV.BSSO.HHZ. 2021-04-12T23:44:52.27 3.0 undecidable manual P 0.18 0
IV.SGO.HHZ. 2021-04-12T23:44:52.22 0.6 undecidable manual S 220 14.9739 133 0.26 49
IV.SNAL.HNE. 2021-04-12T23:44:51.98 0.3 undecidable manual P 328 34.1436 108 0.57 64
IV.MRLC.HHZ. 2021-04-12T23:44:51.32 0.6 undecidable manual S 29 11.6772 141 -0.04 51
IV.CMPR.HHZ. 2021-04-12T23:44:51.90 0.1 undecidable manual P 195 39.627 105 -0.33 92
IX.SCL3.HNZ.02 2021-04-12T23:44:50.79 0.6 undecidable manual S 65 8.2806 151 -0.06 51
IX.BEL3.HNE.01 2021-04-12T23:44:50.16 0.3 undecidable manual P 72 18.9699 125 0.86 58
IX.COL3.HHE.02 2021-04-12T23:44:50.56 0.6 undecidable manual S 288 8.1807 152 -0.27 48
IV.CDRU.HHZ. 2021-04-12T23:44:49.48 0.1 positive manual P 207 21.7671 121 -0.18 97
IX.SNR3.HHE.02 2021-04-12T23:44:49.51 0.3 undecidable manual P 293 20.868 122 -0.04 75
IX.SRN3.HNZ.02 2021-04-12T23:44:49.35 0.1 undecidable manual P 171 19.9689 124 -0.07 100
IV.SGO.HHZ. 2021-04-12T23:44:48.67 0.1 undecidable manual P 220 14.9739 133 -0.16 99
IX.CGG3.HNN.01 2021-04-12T23:44:48.92 0.3 undecidable manual P 148 15.9729 131 -0.01 76
IV.MRLC.HHZ. 2021-04-12T23:44:48.24 0.1 undecidable manual P 29 11.6772 141 -0.24 98
IX.SCL3.HNZ.02 2021-04-12T23:44:47.99 0.1 undecidable manual P 65 8.2806 151 -0.2 99
IX.COL3.HHE.02 2021-04-12T23:44:47.92 0.3 undecidable manual P 288 8.1807 152 -0.26 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MRLC.HNN. ML:1.2 0.00011399999999999999 0.42 AML other m 2021-04-12T23:44:51.92
IV.MRLC.HHN. ML:1.5 0.00024349999999999998 0.42 AML other m 2021-04-12T23:44:51.71
IV.MRLC.HHE. ML:1.4 0.0002035 1.54 AML other m 2021-04-12T23:44:52.98
IV.MRLC.HNE. ML:1.1 0.00009375 1.54 AML other m 2021-04-12T23:44:52.98
IV.SGO.HHE. ML:1.7 0.0003555 0.26 AML other m 2021-04-12T23:44:52.62
IV.SGO.HNN. ML:1.8 0.000481 0.34 AML other m 2021-04-12T23:44:52.82
IV.SGO.HHN. ML:1.9 0.0005105 0.14 AML other m 2021-04-12T23:44:52.82
IV.SGO.HNE. ML:1.4 0.00018030000000000002 0.42 AML other m 2021-04-12T23:44:53.70
IV.CDRU.HHN. ML:1.3 0.0001215 0.32 AML other m 2021-04-12T23:44:53.66
IV.CDRU.HHE. ML:1.6 0.0002275 0.28 AML other m 2021-04-12T23:44:54.10
IV.CMPR.HHN. ML:1.0 0.0000331 1.66 AML other m 2021-04-12T23:44:58.92
IV.CMPR.HHE. ML:1.1 0.000040300000000000004 0.52 AML other m 2021-04-12T23:45:00.06
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