Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.6 on date 18-02-2021 and time 01:32:22 (UTC) in region 2 km NW Valva (SA)

A magnitude ML 1.6 earthquake occured in region: 2 km NW Valva (SA), on

  • 18-02-2021 01:32:22 (UTC)
  • 18-02-2021 02:32:22 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 40.7540, 15.2640 at 8 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
Valva SA 2 1643 1643
Colliano SA 4 3638 5281
Laviano SA 5 1438 6719
Calabritto AV 5 2391 9110
Senerchia AV 5 842 9952
Oliveto Citra SA 7 3802 13754
Caposele AV 7 3483 17237
Santomenna SA 8 443 17680
Castelnuovo di Conza SA 9 619 18299
Palomonte SA 11 3985 22284
Teora AV 11 1537 23821
Contursi Terme SA 12 3394 27215
Conza della Campania AV 13 1373 28588
Sant'Andrea di Conza AV 14 1539 30127
Pescopagano PZ 15 1910 32037
Castelgrande PZ 15 943 32980
Lioni AV 15 6201 39181
San Gregorio Magno SA 16 4286 43467
Buccino SA 16 5047 48514
Campagna SA 16 16703 65217
Acerno SA 17 2783 68000
Cairano AV 18 326 68326
Bagnoli Irpino AV 19 3217 71543
Muro Lucano PZ 19 5497 77040
Morra De Sanctis AV 19 1297 78337

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km NE of Battipaglia (50786 inhabitants)
43 Km E of Avellino (54857 inhabitants)
43 Km E of Salerno (135261 inhabitants)
47 Km E of Cava de' Tirreni (53659 inhabitants)
47 Km W of Potenza (67122 inhabitants)
58 Km SE of Benevento (60091 inhabitants)
62 Km E of Scafati (50787 inhabitants)
66 Km E of Castellammare di Stabia (66466 inhabitants)
76 Km E of Torre del Greco (86275 inhabitants)
77 Km E of Portici (55274 inhabitants)
78 Km E of Ercolano (53709 inhabitants)
78 Km E of Acerra (59573 inhabitants)
78 Km SW of Cerignola (58396 inhabitants)
82 Km S of Foggia (151991 inhabitants)
82 Km E of Afragola (65057 inhabitants)
84 Km E of Casoria (77642 inhabitants)
86 Km E of Napoli (974074 inhabitants)
86 Km E of Caserta (76326 inhabitants)
91 Km E of Giugliano in Campania (122974 inhabitants)
92 Km E of Marano di Napoli (59874 inhabitants)
92 Km E of Aversa (53047 inhabitants)
99 Km E of Pozzuoli (81661 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 2021-02-18
01:32:22		 40.7538 15.2638 8 2021-07-12
16:55:01		 Bollettino Sismico Italiano INGV 87939881
Reviewed
Rev100 		ML 1.6 2021-02-18
01:32:22		 40.7537 15.28 8 2021-02-18
02:17:21		 Sala Sismica INGV-Roma 87263451
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-02-18 01:32:22 ± 0.1
Latitude 40.7538 ± 0.0054
Longitude 15.2638 ± 0.0107
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 87939881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 852
Semi-minor axis of confidence ellipse (meter) 368
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 65
Circular confidence region, given by single value of horizontal uncertainty (meter) 850.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 116
Number of associated phases, regardless of their use for origin computation 28
Number of defining phases 28
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.37
Epicentral distance of station closest to the epicenter (degree) 0.07734
Epicentral distance of station farthest from the epicenter (degree) 0.51531
Number of stations at which the event was observed 21
Number of stations from which data was used for origin computation 21
Magnitudes information

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 18
Type of magnitude ML
Reference to an origin 87263451
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-02-18 02:17:21

ML:1.6

Field Value
Value 1.6
Uncertainty 0.2
Num. used stations 18
Type of magnitude ML
Reference to an origin 87939881
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-03-09 09:03:40
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CMPR.HHZ. 2021-02-18T01:32:38.64 0.6 undecidable manual S 176 48.4182 50 0.05 47
IX.SRN3.HNN.02 2021-02-18T01:32:35.28 0.6 undecidable manual S 151 33.9438 104 0.58 42
IV.CDRU.HHZ. 2021-02-18T01:32:33.67 0.3 undecidable manual S 173 29.5482 106 0.45 67
IV.ACER.HHZ. 2021-02-18T01:32:33.05 0.6 undecidable manual P 86 57.1983 50 -0.12 46
IV.SLCN.HHZ. 2021-02-18T01:32:32.20 0.3 undecidable manual P 142 50.9157 50 -0.01 71
IX.STN3.HNZ.02 2021-02-18T01:32:31.67 0.3 undecidable manual P 127 41.0256 50 0.99 53
IV.CMPR.HHZ. 2021-02-18T01:32:31.41 0.1 undecidable manual P 176 48.4182 50 -0.42 87
IV.SGO.HNE. 2021-02-18T01:32:31.46 0.6 undecidable manual S 170 21.7671 111 0.79 40
IX.SALI.HNE.01 2021-02-18T01:32:31.05 0.6 undecidable manual S 340 20.7681 112 0.71 41
IV.MRLC.HHZ. 2021-02-18T01:32:30.69 0.3 undecidable manual S 89 18.9699 114 0.94 56
IX.LGS3.HNE.01 2021-02-18T01:32:29.81 0.6 undecidable manual P 318 34.5432 50 0.13 47
IX.SRN3.HNN.02 2021-02-18T01:32:29.19 0.1 undecidable manual P 151 33.9438 104 -0.39 90
IX.CGG3.HNE.01 2021-02-18T01:32:29.61 0.1 undecidable manual P 137 32.0457 105 0.4 90
IV.CDRU.HHZ. 2021-02-18T01:32:28.36 0.1 undecidable manual P 173 29.5482 106 -0.37 91
IV.CAFE.HHN. 2021-02-18T01:32:28.72 0.6 undecidable manual P 356 30.4473 105 -0.19 47
IV.SGO.HNE. 2021-02-18T01:32:27.24 0.1 undecidable manual P 170 21.7671 111 -0.01 99
IX.SALI.HNE.01 2021-02-18T01:32:27.09 0.1 undecidable manual P 340 20.7681 112 0.03 99
IX.CLT3.HHE.02 2021-02-18T01:32:27.24 0.1 undecidable manual P 35 20.2686 112 0.26 94
IX.RSF3.HNE.02 2021-02-18T01:32:27.35 0.3 undecidable manual P 343 24.4533 109 -0.41 68
IX.CSG3.HNZ.01 2021-02-18T01:32:26.47 0.6 undecidable manual P 67 18.1707 114 -0.12 49
IX.LIO3.HNE.02 2021-02-18T01:32:26.43 0.1 undecidable manual P 336 17.3715 116 0 100
IX.SCL3.HNN.02 2021-02-18T01:32:26.45 0.1 undecidable manual P 107 21.867 111 -0.81 79
IX.COL3.HHN.02 2021-02-18T01:32:26.70 0.3 undecidable manual S 143 9.2796 132 -0.2 73
IV.SNAL.HHZ. 2021-02-18T01:32:26.93 0.1 negative manual P 346 19.5693 113 0.09 98
IV.MRLC.HHZ. 2021-02-18T01:32:26.45 0.1 negative manual P 89 18.9699 114 -0.27 94
IV.MCRV.HHZ. 2021-02-18T01:32:25.14 0.1 negative manual P 292 8.5803 134 0.16 98
IX.VDS3.HNE.01 2021-02-18T01:32:25.46 0.1 undecidable manual P 96 13.7751 121 -0.35 94
IX.COL3.HHN.02 2021-02-18T01:32:24.82 0.1 negative manual P 143 9.2796 132 -0.26 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MCRV.HHE. ML:1.9 0.001278 0.86 AML other m 2021-02-18T01:32:29.07
IV.MCRV.HHN. ML:2.0 0.00148 1.3 AML other m 2021-02-18T01:32:30.16
IV.MRLC.HHN. ML:1.8 0.000492 1.68 AML other m 2021-02-18T01:32:33.12
IV.MRLC.HNN. ML:1.5 0.00023649999999999998 1.68 AML other m 2021-02-18T01:32:33.12
IV.MRLC.HHE. ML:1.8 0.00048750000000000003 1.5 AML other m 2021-02-18T01:32:33.98
IV.MRLC.HNE. ML:1.5 0.0002405 1.5 AML other m 2021-02-18T01:32:33.98
IV.CDRU.HHN. ML:1.1 0.0000669 1.56 AML other m 2021-02-18T01:32:34.21
IV.CDRU.HHE. ML:1.4 0.000128 0.44 AML other m 2021-02-18T01:32:35.50
IV.SNAL.HNE. ML:1.7 0.0003915 0.96 AML other m 2021-02-18T01:32:36.24
IV.SNAL.HHE. ML:1.7 0.0004285 0.94 AML other m 2021-02-18T01:32:36.25
IV.SNAL.HHN. ML:1.8 0.0005394999999999999 0.68 AML other m 2021-02-18T01:32:38.29
IV.SNAL.HNN. ML:1.8 0.0005185 0.7 AML other m 2021-02-18T01:32:38.28
IV.CMPR.HHN. ML:1.1 0.0000361 0.56 AML other m 2021-02-18T01:32:40.60
IV.CMPR.HHE. ML:1.3 0.0000547 1.68 AML other m 2021-02-18T01:32:41.94
IV.SLCN.HHE. ML:1.8 0.00014649999999999998 1.58 AML other m 2021-02-18T01:32:45.05
IV.ACER.HHE. ML:1.4 0.000052449999999999994 0.58 AML other m 2021-02-18T01:32:45.90
IV.ACER.HHN. ML:1.5 0.00006665000000000001 0.76 AML other m 2021-02-18T01:32:48.72
IV.SLCN.HHN. ML:1.6 0.00009615 0.66 AML other m 2021-02-18T01:32:50.04
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