Istituto Nazionale di Geofisica e Vulcanologia

Earthquake (quarry blast) with magnitude of ML 1.8 on date 19-07-2021 and time 20:17:58 (Italy) in region 4 km SW Guardiaregia (CB)

A magnitude ML 1.8 (quarry blast) earthquake occured in region: 4 km SW Guardiaregia (CB), on

  • 19-07-2021 18:17:58 (UTC)
  • 19-07-2021 20:17:58 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.4040, 14.5210 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
Guardiaregia CB 4 801 801
Campochiaro CB 5 646 1447
San Polo Matese CB 7 470 1917
Pietraroja BN 7 545 2462
Cusano Mutri BN 7 4091 6553
Sepino CB 8 1964 8517
Bojano CB 10 8058 16575
Vinchiaturo CB 12 3324 19899
San Giuliano del Sannio CB 12 1029 20928
Colle d'Anchise CB 12 807 21735
Sassinoro BN 12 618 22353
Castello del Matese CE 13 1494 23847
San Gregorio Matese CE 13 988 24835
San Potito Sannitico CE 13 1925 26760
Gioia Sannitica CE 13 3638 30398
Piedimonte Matese CE 13 11297 41695
San Massimo CB 14 855 42550
Cerreto Sannita BN 14 3940 46490
Cercepiccola CB 14 681 47171
Morcone BN 14 4932 52103
San Lorenzello BN 14 2227 54330
Baranello CB 14 2673 57003
Faicchio BN 14 3634 60637
Spinete CB 16 1320 61957
Cantalupo nel Sannio IS 17 739 62696
Busso CB 17 1273 63969
Roccamandolfi IS 17 938 64907
Alife CE 18 7616 72523
Guardia Sanframondi BN 18 5078 77601
Santa Croce del Sannio BN 18 927 78528
Mirabello Sannitico CB 18 2180 80708
Cercemaggiore CB 18 3777 84485
San Lupo BN 19 801 85286
San Salvatore Telesino BN 19 3999 89285
Castelvenere BN 19 2562 91847
Ferrazzano CB 19 3344 95191
Pontelandolfo BN 19 2167 97358
San Lorenzo Maggiore BN 19 2154 99512
Sant'Elena Sannita IS 20 275 99787
Macchiagodena IS 20 1854 101641
Casalciprano CB 20 564 102205

Municipalities with at least 50000 inhabitants

An earthquake occurred to
37 Km NW of Benevento (60091 inhabitants)
40 Km NE of Caserta (76326 inhabitants)
52 Km N of Acerra (59573 inhabitants)
55 Km NE of Aversa (53047 inhabitants)
56 Km NE of Afragola (65057 inhabitants)
59 Km NE of Casoria (77642 inhabitants)
59 Km NW of Avellino (54857 inhabitants)
59 Km NE of Giugliano in Campania (122974 inhabitants)
63 Km NE of Marano di Napoli (59874 inhabitants)
66 Km N of Portici (55274 inhabitants)
67 Km NE of Napoli (974074 inhabitants)
68 Km N of Ercolano (53709 inhabitants)
70 Km N of Torre del Greco (86275 inhabitants)
72 Km NE of Pozzuoli (81661 inhabitants)
73 Km N of Scafati (50787 inhabitants)
78 Km W of San Severo (53905 inhabitants)
79 Km N of Castellammare di Stabia (66466 inhabitants)
80 Km N of Cava de' Tirreni (53659 inhabitants)
83 Km N of Salerno (135261 inhabitants)
86 Km W of Foggia (151991 inhabitants)
97 Km NW of Battipaglia (50786 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 1.8 2021-07-19
18:17:58		 41.404 14.5212 1 2021-12-29
11:12:50		 Bollettino Sismico Italiano INGV 97208031
Reviewed
Rev100 		ML 1.9 2021-07-19
18:17:58		 41.3922 14.5213 8 2021-07-19
18:29:03		 Sala Sismica INGV-Roma 92962401
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2021-07-19 18:17:58 ± 0.14
Latitude 41.4040 ± 0.0090
Longitude 14.5212 ± 0.0132
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 97208031

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 1130
Semi-minor axis of confidence ellipse (meter) 900
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 235
Circular confidence region, given by single value of horizontal uncertainty (meter) 1130.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 72
Number of associated phases, regardless of their use for origin computation 13
Number of defining phases 13
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.41
Epicentral distance of station closest to the epicenter (degree) 0.04047
Epicentral distance of station farthest from the epicenter (degree) 0.68169
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitudes information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 97208031
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2021-11-03 17:11:52

ML:1.9

Field Value
Value 1.9
Uncertainty 0.2
Num. used stations 28
Type of magnitude ML
Reference to an origin 92962401
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2021-07-19 18:29:03
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.POFI.HHZ. 2021-07-19T18:18:12.09 0.3 undecidable manual P 298 75.6687 50 -1.3 42
IV.RNI2.HHZ. 2021-07-19T18:18:07.38 0.3 undecidable manual P 317 45.1215 91 -0.63 61
IV.TST01.HHZ. 2021-07-19T18:18:07.67 0.6 undecidable manual P 344 39.8268 91 0.72 40
IV.TRIV.HHZ. 2021-07-19T18:18:06.96 0.3 undecidable manual P 3 40.3263 91 -0.08 71
IV.PIGN.HHZ. 2021-07-19T18:18:06.63 0.3 undecidable manual P 232 36.3414 91 0.38 67
IV.PSB1.HNE. 2021-07-19T18:18:05.19 0.3 undecidable manual P 130 31.3464 91 -0.07 72
IV.MIDA.HNZ. 2021-07-19T18:18:05.80 0.3 undecidable manual P 320 34.4433 91 -0.08 71
IV.VAGA.HHZ. 2021-07-19T18:18:03.93 0.3 undecidable manual P 273 23.8539 91 0.17 71
IV.VITU.HHZ. 2021-07-19T18:18:03.69 0.3 undecidable manual P 160 26.1516 91 -0.51 66
IV.BSSO.HHZ. 2021-07-19T18:18:02.76 0.3 undecidable manual P 21 16.872 92 0.41 69
IV.SACR.HHZ. 2021-07-19T18:18:02.16 0.3 undecidable manual P 93 15.3735 92 0.1 74
IV.SGG.HHZ. 2021-07-19T18:18:01.69 0.1 undecidable manual P 261 11.9769 92 0.32 94
IV.PTRJ.HHZ. 2021-07-19T18:17:59.97 0.1 undecidable manual P 172 4.4955 96 0.1 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.SGG.HHN. ML:1.9 0.0012250000000000002 0.44 AML other m 2021-07-19T18:18:05.80
IV.SGG.HHE. ML:2.0 0.001745 1.6 AML other m 2021-07-19T18:18:07.05
IV.SGG.HNE. ML:2.1 0.00202 0.48 AML other m 2021-07-19T18:18:07.29
IV.SGG.HNN. ML:1.9 0.001315 1.02 AML other m 2021-07-19T18:18:08.31
IV.SACR.HHE. ML:1.9 0.000919 0.88 AML other m 2021-07-19T18:18:08.90
IV.SACR.HNE. ML:1.9 0.0009355 0.92 AML other m 2021-07-19T18:18:08.92
IV.BSSO.HHN. ML:1.9 0.0007535 0.54 AML other m 2021-07-19T18:18:09.72
IV.BSSO.HNN. ML:1.8 0.0007275000000000001 0.54 AML other m 2021-07-19T18:18:09.72
IV.VITU.HHN. ML:2.1 0.000748 0.46 AML other m 2021-07-19T18:18:10.59
IV.SACR.HNN. ML:1.9 0.0009965 0.82 AML other m 2021-07-19T18:18:10.02
IV.SACR.HHN. ML:2.0 0.0010754999999999999 0.82 AML other m 2021-07-19T18:18:10.02
IV.VAGA.HHE. ML:1.8 0.0004 1.2 AML other m 2021-07-19T18:18:10.67
IV.VAGA.HNE. ML:2.0 0.0006705 0.84 AML other m 2021-07-19T18:18:10.49
IV.VAGA.HNN. ML:2.0 0.0007655000000000001 1.36 AML other m 2021-07-19T18:18:10.93
IV.BSSO.HHE. ML:1.8 0.0007275000000000001 1.64 AML other m 2021-07-19T18:18:10.12
IV.BSSO.HNE. ML:1.8 0.0007019999999999999 1.64 AML other m 2021-07-19T18:18:10.12
IV.VITU.HHE. ML:2.0 0.0005635 0.32 AML other m 2021-07-19T18:18:11.15
IV.VAGA.HHN. ML:2.1 0.000808 0.34 AML other m 2021-07-19T18:18:14.46
IV.PIGN.HHE. ML:1.5 0.00012255 1.48 AML other m 2021-07-19T18:18:19.01
IV.TRIV.HNE. ML:1.6 0.00014175 0.52 AML other m 2021-07-19T18:18:20.40
IV.TRIV.HHE. ML:1.6 0.0001462 0.44 AML other m 2021-07-19T18:18:20.40
IV.RNI2.HHE. ML:1.6 0.00012145 0.62 AML other m 2021-07-19T18:18:20.35
IV.TRIV.HHN. ML:1.7 0.0001945 0.72 AML other m 2021-07-19T18:18:21.56
IV.TRIV.HNN. ML:1.7 0.0001825 0.7 AML other m 2021-07-19T18:18:21.58
IV.PIGN.HHN. ML:1.4 0.0000924 0.5 AML other m 2021-07-19T18:18:21.71
IV.RNI2.HHN. ML:1.7 0.00016849999999999998 0.66 AML other m 2021-07-19T18:18:23.79
IV.POFI.HHN. ML:1.2 0.000025849999999999998 0.98 AML other m 2021-07-19T18:18:31.58
IV.POFI.HHE. ML:1.2 0.000025399999999999997 1.34 AML other m 2021-07-19T18:18:40.30
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