Earthquake with magnitude of ML 1.7 on date 07-07-2021 and time 15:50:23 (Italy) in region 2 km SW Valva (SA)

A magnitude ML 1.7 earthquake occured in region: 2 km SW Valva (SA), on

  • 07-07-2021 13:50:23 (UTC)
  • 07-07-2021 15:50:23 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 40.722, 15.26 at 19 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.

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 3 3638 5281
Oliveto Citra SA 4 3802 9083
Senerchia AV 5 842 9925
Palomonte SA 7 3985 13910
Calabritto AV 8 2391 16301
Laviano SA 8 1438 17739
Contursi Terme SA 8 3394 21133
Caposele AV 11 3483 24616
Santomenna SA 11 443 25059
Castelnuovo di Conza SA 12 619 25678
Buccino SA 14 5047 30725
San Gregorio Magno SA 14 4286 35011
Campagna SA 14 16703 51714
Teora AV 14 1537 53251
Castelgrande PZ 16 943 54194
Conza della Campania AV 16 1373 55567
Sant'Andrea di Conza AV 17 1539 57106
Serre SA 17 3995 61101
Acerno SA 17 2783 63884
Pescopagano PZ 17 1910 65794
Romagnano al Monte SA 18 368 66162
Lioni AV 18 6201 72363
Postiglione SA 18 2151 74514
Sicignano degli Alburni SA 19 3519 78033
Muro Lucano PZ 19 5497 83530
Ricigliano SA 20 1144 84674

Municipalities with at least 50000 inhabitants

An earthquake occurred to
26 Km E of Battipaglia (50786 inhabitants)
42 Km E of Salerno (135261 inhabitants)
45 Km SE of Avellino (54857 inhabitants)
47 Km E of Cava de' Tirreni (53659 inhabitants)
47 Km W of Potenza (67122 inhabitants)
61 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)
79 Km E of Acerra (59573 inhabitants)
81 Km SW of Cerignola (58396 inhabitants)
83 Km E of Afragola (65057 inhabitants)
84 Km E of Casoria (77642 inhabitants)
86 Km S of Foggia (151991 inhabitants)
86 Km E of Napoli (974074 inhabitants)
87 Km E of Caserta (76326 inhabitants)
92 Km E of Giugliano in Campania (122974 inhabitants)
92 Km E of Marano di Napoli (59874 inhabitants)
93 Km E of Aversa (53047 inhabitants)
99 Km E of Pozzuoli (81661 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Preliminary map of the earthquake effects from the web questionnaire

Preliminary map of the earthquake effects from the web questionnaire

This map shows the distribution of the effects of the earthquake on the territory in terms of the MCS (Mercalli-Cancani-Sieberg) intensity scale. The intensities are determined using the data provided in the questionnaire (http://www.haisentitoilterremoto.it/) that are analysed using robust statistical techniques since they are not verified individually. Specifically, the assignment of MCS intensities greater or equal the VI degree of the MCS scale require opportune in situ verification by professional experts. The purple start shows the epicenter. This map is prepared every so often that the population fill in new questionnaires. The number of questionnaires used to determine the map and the date and time of the last adjournment are shown in the upper right part of the panel.
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100
ML 1.7 2021-07-07
13:50:23
40.7225 15.2595 19 2021-07-07
13:59:41
Sala Sismica INGV-Roma 92361881
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-07 13:50:23 ± 0.41
Latitude 40.7225 ± 0.0117
Longitude 15.2595 ± 0.0368
Depth (km) 19 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 92361881

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 2816
Semi-minor axis of confidence ellipse (meter) 1435
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 266
Circular confidence region, given by single value of horizontal uncertainty (meter) 2820
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 187
Number of associated phases, regardless of their use for origin computation 21
Number of defining phases 17
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.30577
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 9
Magnitude information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.4
Num. used stations 12
Type of magnitude ML
Reference to an origin 92361881
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-07 13:59:41
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.GRIS.EHZ. 2021-07-07T13:50:54.52 3.0 undecidable manual S -4.65 0
IV.MGR.HHZ. 2021-07-07T13:50:43.83 3.0 undecidable manual S -0.39 0
IV.CAFE.HHZ. 2021-07-07T13:50:37.36 0.3 undecidable manual S 357 0.3058 110 1.83 35
IV.PZUN.HHZ. 2021-07-07T13:50:37.59 3.0 undecidable manual S -0.02 0
IV.ACER.HHZ. 2021-07-07T13:50:33.67 3.0 positive manual P 0.2 0
IX.SALI.HNE. 2021-07-07T13:50:33.52 0.6 undecidable manual S 344 0.2158 120 0.41 47
IV.SNAL.HHZ. 2021-07-07T13:50:33.27 0.3 undecidable manual S 349 0.2059 121 0.41 70
IX.CMP3.HNE.02 2021-07-07T13:50:32.62 0.6 undecidable manual S 243 0.1529 131 1.03 36
IX.PST3.HNE.01 2021-07-07T13:50:32.34 0.6 undecidable manual S 184 0.1619 130 0.55 45
IX.NSC3.EHZ. 2021-07-07T13:50:31.68 0.6 undecidable manual S 320 0.1619 130 -0.11 50
IX.SNR3.EHZ.02 2021-07-07T13:50:30.19 0.3 undecidable manual S 285 0.0522 161 0.3 74
IV.CAFE.HHZ. 2021-07-07T13:50:30.63 0.1 undecidable manual P 357 0.3058 110 0.13 97
IV.MCRV.HHZ. 2021-07-07T13:50:29.81 0.3 undecidable manual S 311 0.0917 148 -0.59 67
IX.LIO3.HHE.02 2021-07-07T13:50:28.73 0.1 undecidable manual P 341 0.1844 125 0.09 100
IV.SNAL.HHZ. 2021-07-07T13:50:28.60 0.1 undecidable manual P 349 0.2059 121 -0.36 93
IX.CMP3.HNE.02 2021-07-07T13:50:28.39 0.1 undecidable manual P 243 0.1529 131 0.17 98
IX.SALI.HNE. 2021-07-07T13:50:28.61 0.1 undecidable manual P 344 0.2158 120 -0.49 90
IX.PST3.HNE.01 2021-07-07T13:50:28.26 0.3 undecidable manual P 184 0.1619 130 -0.08 75
IX.NSC3.EHZ. 2021-07-07T13:50:27.93 1.0 undecidable manual P 320 0.1619 130 -0.41 23
IX.SNR3.EHZ.02 2021-07-07T13:50:26.19 1.0 negative manual P 285 0.0522 161 -1.05 18
IV.MCRV.HHZ. 2021-07-07T13:50:26.63 0.1 undecidable manual P 311 0.0917 148 -0.91 78
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IX.SNR3.HNN.01 ML:2.5 0.00254 0.62 AML other m 2021-07-07T13:50:30.23
IX.SNR3.HNE.01 ML:2.6 0.00343 0.98 AML other m 2021-07-07T13:50:30.64
IX.SNR3.EHE.02 ML:2.4 0.002395 0.8 AML other m 2021-07-07T13:50:30.94
IX.SNR3.EHN.02 ML:2.4 0.00223 0.8 AML other m 2021-07-07T13:50:31.63
IX.NSC3.EHN.02 ML:1.5 0.000191 1.18 AML other m 2021-07-07T13:50:31.88
IX.NSC3.EHE.02 ML:1.6 0.000215 1.38 AML other m 2021-07-07T13:50:33.29
IV.CAFE.HHN. ML:1.2 6.085E-5 1.56 AML other m 2021-07-07T13:50:38.84
IV.CAFE.HHE. ML:1.3 7.14E-5 0.32 AML other m 2021-07-07T13:50:39.28
IV.SNAL.HHN. ML:1.7 0.000235 1.28 AML other m 2021-07-07T13:50:39.99
IV.SNAL.HNN. ML:1.6 0.000225 0.94 AML other m 2021-07-07T13:50:39.00
IV.SNAL.HHE. ML:1.6 0.0001955 1.14 AML other m 2021-07-07T13:50:43.94
IV.SNAL.HNE. ML:1.6 0.0002015 0.8 AML other m 2021-07-07T13:50:44.00
IV.ACER.HHN. ML:1.4 4.825E-5 0.6 AML other m 2021-07-07T13:50:46.28
IV.ACER.HHE. ML:1.3 4.58E-5 0.58 AML other m 2021-07-07T13:50:48.89
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