Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 1.3 on date 06-08-2021 and time 12:42:35 (Italy) in region 4 km SW San Polo Matese (CB)

A magnitude ML 1.3 (quarry blast) earthquake occured in region: 4 km SW San Polo Matese (CB), on

  • 06-08-2021 10:42:35 (UTC)
  • 06-08-2021 12:42:35 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.4360, 14.4680 at 0 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Event type: quarry blast.

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
Campochiaro CB 4 646 646
San Polo Matese CB 4 470 1116
Bojano CB 5 8058 9174
Guardiaregia CB 6 801 9975
San Massimo CB 8 855 10830
Colle d'Anchise CB 9 807 11637
San Gregorio Matese CE 10 988 12625
Castello del Matese CE 11 1494 14119
Cusano Mutri BN 11 4091 18210
Cantalupo nel Sannio IS 12 739 18949
Piedimonte Matese CE 12 11297 30246
Roccamandolfi IS 12 938 31184
Pietraroja BN 12 545 31729
Vinchiaturo CB 12 3324 35053
Spinete CB 12 1320 36373
San Potito Sannitico CE 12 1925 38298
Baranello CB 13 2673 40971
Sepino CB 13 1964 42935
San Giuliano del Sannio CB 15 1029 43964
Macchiagodena IS 15 1854 45818
Gioia Sannitica CE 15 3638 49456
Santa Maria del Molise IS 15 665 50121
Busso CB 16 1273 51394
Sant'Elena Sannita IS 16 275 51669
Alife CE 16 7616 59285
Cercepiccola CB 17 681 59966
Casalciprano CB 17 564 60530
Castelpetroso IS 17 1680 62210
Faicchio BN 17 3634 65844
Castelpizzuto IS 18 155 65999
Sassinoro BN 18 618 66617
Valle Agricola CE 18 890 67507
Letino CE 18 712 68219
Cerreto Sannita BN 18 3940 72159
Frosolone IS 19 3170 75329
San Lorenzello BN 19 2227 77556
Sant'Angelo d'Alife CE 19 2270 79826
Mirabello Sannitico CB 19 2180 82006
Oratino CB 19 1641 83647
Morcone BN 20 4932 88579

Municipalities with at least 50000 inhabitants

An earthquake occurred to
42 Km N of Caserta (76326 inhabitants)
43 Km NW of Benevento (60091 inhabitants)
55 Km N of Acerra (59573 inhabitants)
56 Km NE of Aversa (53047 inhabitants)
59 Km N of Afragola (65057 inhabitants)
61 Km NE of Giugliano in Campania (122974 inhabitants)
61 Km N of Casoria (77642 inhabitants)
64 Km NE of Marano di Napoli (59874 inhabitants)
64 Km NW of Avellino (54857 inhabitants)
69 Km N of Portici (55274 inhabitants)
69 Km N of Napoli (974074 inhabitants)
70 Km N of Ercolano (53709 inhabitants)
73 Km NE of Pozzuoli (81661 inhabitants)
73 Km N of Torre del Greco (86275 inhabitants)
77 Km N of Scafati (50787 inhabitants)
81 Km W of San Severo (53905 inhabitants)
82 Km N of Castellammare di Stabia (66466 inhabitants)
84 Km N of Cava de' Tirreni (53659 inhabitants)
88 Km N of Salerno (135261 inhabitants)
90 Km W of Foggia (151991 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 1.3 2021-08-06
10:42:35		 41.4358 14.4683 1 2021-12-29
11:12:31		 Bollettino Sismico Italiano INGV 95596671
Reviewed
Rev100 		ML 1.4 2021-08-06
10:42:35		 41.4132 14.4563 10 2021-08-06
10:52:44		 Sala Sismica INGV-Roma 93745521
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-08-06 10:42:35 ± 0.06
Latitude 41.4358 ± 0.0045
Longitude 14.4683 ± 0.0048
Depth (km) 1 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type quarry blast
Origin ID 95596671

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 490
Semi-minor axis of confidence ellipse (meter) 400
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 14
Circular confidence region, given by single value of horizontal uncertainty (meter) 490.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 80
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
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) 0.08274
Epicentral distance of station farthest from the epicenter (degree) 0.37322
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitudes information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.2
Num. used stations 10
Type of magnitude ML
Reference to an origin 95596671
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-09-18 17:57:01

ML:1.4

Field Value
Value 1.4
Uncertainty 0.2
Num. used stations 13
Type of magnitude ML
Reference to an origin 93745521
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-08-06 10:52:44
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.CERA.HHZ. 2021-08-06T10:42:44.28 0.6 undecidable manual P 296 41.4252 91 -0.02 48
IV.VITU.HNZ. 2021-08-06T10:42:42.09 0.3 undecidable manual P 154 31.1466 91 -0.13 72
IV.MIDA.HHZ. 2021-08-06T10:42:41.62 0.3 undecidable manual P 322 28.9488 91 -0.17 72
IV.SACR.HNZ. 2021-08-06T10:42:39.86 0.3 undecidable manual P 102 20.1687 91 -0.18 73
IV.VAGA.HHZ. 2021-08-06T10:42:39.88 0.1 undecidable manual P 263 19.5693 91 -0.04 100
IV.BSSO.HHZ. 2021-08-06T10:42:39.39 0.1 undecidable manual P 40 16.0728 92 0.18 98
IV.SGG.HHZ. 2021-08-06T10:42:37.98 0.1 undecidable manual P 234 9.1797 93 0.14 100
IV.PTRJ.HHZ. 2021-08-06T10:42:37.99 0.3 undecidable manual P 148 9.3795 93 0.11 75
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.BSSO.HNE. ML:1.6 0.00045512655 1.7632 AML other m 2021-08-06T10:42:44.03
IV.BSSO.HHE. ML:1.6 0.000482 1.74 AML other m 2021-08-06T10:42:44.03
IV.BSSO.HNN. ML:1.3 0.000233159 0.4352 AML other m 2021-08-06T10:42:46.68
IV.BSSO.HHN. ML:1.3 0.000237 0.44 AML other m 2021-08-06T10:42:46.68
IV.VAGA.HNN. ML:1.4 0.0002441607 0.2304 AML other m 2021-08-06T10:42:46.76
IV.VAGA.HHN. ML:1.5 0.0002605 0.24 AML other m 2021-08-06T10:42:46.88
IV.VAGA.HHE. ML:1.1 0.00011479999999999999 0.32 AML other m 2021-08-06T10:42:48.43
IV.MIDA.HHN. ML:1.1 0.0000688 0.78 AML other m 2021-08-06T10:42:53.00
IV.MIDA.HHE. ML:1.0 0.000056149999999999996 1.24 AML other m 2021-08-06T10:42:54.11
IV.MIDA.HNE. ML:1.1 0.000062941815 1.4176 AML other m 2021-08-06T10:42:56.12
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