INGVCENTRO​NAZIONALE​TERREMOTI
Sala Sismica

Earthquake with magnitude of ML 2.1 on date 18-04-2018 and time 11:25:38 (Italy) in region 2 km S Alvignano (CE)

A magnitude ML 2.1 earthquake occured in region: 2 km S Alvignano (CE), on

  • 18-04-2018 09:25:38 (UTC)
  • 18-04-2018 11:25:38 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.23, 14.34 at 8 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
Alvignano CE 2 4824 4824
Liberi CE 5 1153 5977
Dragoni CE 5 2108 8085
Castel di Sasso CE 6 1171 9256
Ruviano CE 6 1655 10911
Caiazzo CE 6 5595 16506
Piana di Monte Verna CE 7 2390 18896
Pontelatone CE 9 1703 20599
Puglianello BN 9 1349 21948
Formicola CE 9 1488 23436
Amorosi BN 11 2797 26233
Alife CE 11 7616 33849
Baia e Latina CE 11 2197 36046
Castel Campagnano CE 11 1581 37627
Roccaromana CE 11 856 38483
Limatola BN 11 4073 42556
Gioia Sannitica CE 12 3638 46194
Camigliano CE 12 1943 48137
Bellona CE 12 6053 54190
Castel Morrone CE 12 3858 58048
Vitulazio CE 13 7420 65468
San Potito Sannitico CE 13 1925 67393
Giano Vetusto CE 13 647 68040
Pastorano CE 13 3033 71073
Faicchio BN 13 3634 74707
San Salvatore Telesino BN 13 3999 78706
Pietramelara CE 14 4722 83428
Piedimonte Matese CE 14 11297 94725
Dugenta BN 14 2798 97523
Pignataro Maggiore CE 15 6084 103607
Rocchetta e Croce CE 15 460 104067
Castello del Matese CE 15 1494 105561
Melizzano BN 16 1858 107419
Telese Terme BN 16 7486 114905
Sant'Angelo d'Alife CE 16 2270 117175
Riardo CE 16 2321 119496
Casagiove CE 17 13651 133147
San Prisco CE 17 12345 145492
Castelvenere BN 17 2562 148054
San Gregorio Matese CE 17 988 149042
Caserta CE 17 76326 225368
Raviscanina CE 18 1319 226687
Capua CE 18 18820 245507
San Lorenzello BN 18 2227 247734
Calvi Risorta CE 18 5707 253441
Frasso Telesino BN 18 2318 255759
Casapulla CE 18 8628 264387
Valle di Maddaloni CE 18 2742 267129
Pietravairano CE 18 2984 270113
Curti CE 18 7132 277245
Solopaca BN 18 3820 281065
Santa Maria Capua Vetere CE 18 32802 313867
Cusano Mutri BN 18 4091 317958
Cerreto Sannita BN 19 3940 321898
San Tammaro CE 19 5549 327447
Macerata Campania CE 20 10609 338056
Recale CE 20 7773 345829
San Nicola la Strada CE 20 22448 368277
Portico di Caserta CE 20 7802 376079

Municipalities with at least 50000 inhabitants

An earthquake occurred to
17 Km N of Caserta (76326 inhabitants)
31 Km NE of Aversa (53047 inhabitants)
32 Km N of Acerra (59573 inhabitants)
34 Km N of Afragola (65057 inhabitants)
36 Km NE of Giugliano in Campania (122974 inhabitants)
36 Km N of Casoria (77642 inhabitants)
39 Km W of Benevento (60091 inhabitants)
39 Km NE of Marano di Napoli (59874 inhabitants)
44 Km N of Napoli (974074 inhabitants)
45 Km N of Portici (55274 inhabitants)
47 Km N of Ercolano (53709 inhabitants)
48 Km NE of Pozzuoli (81661 inhabitants)
50 Km N of Torre del Greco (86275 inhabitants)
52 Km NW of Avellino (54857 inhabitants)
56 Km N of Scafati (50787 inhabitants)
61 Km N of Castellammare di Stabia (66466 inhabitants)
67 Km NW of Cava de' Tirreni (53659 inhabitants)
71 Km NW of Salerno (135261 inhabitants)
88 Km NW of Battipaglia (50786 inhabitants)
Recent and historical Seismicity

These maps show the seismicity for different time windows. The earthquake locations reported in these maps are determined in quasi real-time by the personnel on duty in the seismic surveillance center of INGV in Rome. Note that the earthquake source parameters (hypocentral location and magnitude) are the best estimates obstained with the available data and they are adjourned as additional data become available. The source parameters obtained by the personnel on duty are then revised by the group in charge of the INGV Seismic Bulletin (Bollettino Sismico Italiano dell’INGV).

Earthquakes of the last three days (72 hours)

Earthquakes of the last three days (72 hours)

This map reports the earthquake epicenters located in the past 72 hours (3 days) from the time this page has been generated. The radius of the circle representing the earthquake on the map scales with magnitude. The color depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours). The open star shows the epicenter of the current earthquake.
Earthquakes of the last 90 days

Earthquakes of the last 90 days

This map reports the Magnitudo ≥ 1.0 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Earthquakes since 1985

Earthquakes since 1985

This map reports the Magnitudo ≥ 2.5 earthquake epicenters located using the data acquired by the Italian National Seismic Network and by other collaborating networks in Italy and in the neighbouring countries. The radii of the circles representing the epicenters on the map scale with magnitude. The color of each circle depends on the time of occurrence of the earthquakes with respect to the time of generation of the map (red = 1 hour; orange = 24 hours; yellow = 72 hours; blue = all other earthquakes). The open star shows the epicenter of the current earthquake.
Significant earthquakes since 1000 AD until 2006

Significant earthquakes since 1000 AD until 2006

This map shows the epicenters of the historical earthquakes catalogue CPT11 (Catalogo Parametrico dei Terremoti Italiani, 2011 version) with estimated magnitude ≥ 5.0 since 1000 AD until 2006. The epicenters are represented by squares which sides scale with the estimated earthquake magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The open star shows the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
The earthquake effects in MCS scale as obtained from the compiled questionnaire

The earthquake effects in MCS scale as obtained from the compiled 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 Date and Time (UTC) Latitude Longitude Magnitude Depth (km) Published time (UTC) Author Location ID
Rev 100 2018-04-18
09:25:38
41.23 14.34 ML 2.1 8 2018-04-18
09:45:49
Sala Sismica INGV-Roma 55776501
Best location and best magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2018-04-18 09:25:38 ± 0.14
Latitude 41.23 ± 0.01
Longitude 14.34 ± 0.01
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 55776501

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 787
Semi-minor axis of confidence ellipse (meter) 728
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 170
Circular confidence region, given by single value of horizontal uncertainty (meter) 790
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 115
Number of associated phases, regardless of their use for origin computation 38
Number of defining phases 18
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.45
Epicentral distance of station closest to the epicenter (degree) 0
Epicentral distance of station farthest from the epicenter (degree) 0.55668
Number of stations at which the event was observed 32
Number of stations from which data was used for origin computation 12
Magnitude information

ML:2.1

Field Value
Value 2.1
Uncertainty 0.3
Num. used stations 32
Type of magnitude ML
Reference to an origin 55776501
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2018-04-18 09:45:49
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
IV.NDIM.HHZ. 2018-04-18T09:27:34.91 3.0 undecidable manual Sn -5.28 0
IV.EL6.EHZ. 2018-04-18T09:26:49.16 3.0 undecidable manual Sg 1.35 0
IV.HMDC.HHZ. 2018-04-18T09:26:48.18 3.0 positive manual Pn 2.96 0
IV.SNTG.HHZ. 2018-04-18T09:26:47.42 3.0 undecidable manual Sg 0.04 0
IV.CESI.HHZ. 2018-04-18T09:26:46.14 3.0 undecidable manual Sg 3.81 0
IV.PF6.EHZ. 2018-04-18T09:26:46.03 3.0 undecidable manual Sg 3.17 0
IV.FOSV.EHZ. 2018-04-18T09:26:46.61 3.0 undecidable manual Sn -3.12 0
IV.MML1.EHZ. 2018-04-18T09:26:45.12 3.0 undecidable manual Sg 1.07 0
IV.FDMO.HHZ. 2018-04-18T09:26:44.42 3.0 undecidable manual Sg 2.98 0
IV.T1220.EHZ. 2018-04-18T09:26:41.14 3.0 undecidable manual Sn -1.9 0
OB.GAVE.EHZ. 2018-04-18T09:26:38.23 3.0 undecidable manual Sg 2.21 0
CR.STON.BHZ. 2018-04-18T09:26:34.90 3.0 positive manual Pg 6.97 0
IV.PIEI.HHZ. 2018-04-18T09:26:24.09 3.0 negative manual Pn 1.46 0
IV.CAR1.HHZ. 2018-04-18T09:26:19.69 3.0 undecidable manual Pn -0.57 0
IV.TDS.HHZ. 2018-04-18T09:26:14.62 3.0 negative manual Pn -2.24 0
IV.RCAV.EHZ. 2018-04-18T09:26:14.95 3.0 undecidable manual S -6.14 0
IV.MSAG.HHZ. 2018-04-18T09:26:03.36 3.0 positive manual P -1.06 0
IV.CERA.HHZ. 2018-04-18T09:25:57.25 0.6 undecidable manual S 327 0.438 50 2.72 7
IV.LRP.EHZ. 2018-04-18T09:25:54.06 3.0 negative manual P 0.71 0
IV.GIUL.HHZ. 2018-04-18T09:25:54.13 3.0 undecidable manual P 0
IV.MODR.HHZ. 2018-04-18T09:25:53.24 0.3 undecidable manual S 256 0.3588 50 1.06 53
IV.SACR.HHN. 2018-04-18T09:25:52.51 0.6 undecidable manual S 59 0.3193 50 1.5 27
IV.TRIV.HHZ. 2018-04-18T09:25:49.66 0.1 undecidable manual P 16 0.5567 50 -0.08 90
IV.VTIR.HHZ. 2018-04-18T09:25:49.23 3.0 undecidable manual P 0
IV.RNI2.HNE. 2018-04-18T09:25:48.81 0.1 undecidable manual P 343 0.4919 50 0.18 90
IV.VITU.HHZ. 2018-04-18T09:25:48.03 0.6 undecidable manual S 103 0.223 108 0.6 42
IV.VAGA.HHZ. 2018-04-18T09:25:47.10 0.3 undecidable manual S 336 0.1996 110 0.5 66
IV.CERA.HHZ. 2018-04-18T09:25:47.52 0.1 undecidable manual P 327 0.438 50 -0.2 90
IV.BSSO.HHZ. 2018-04-18T09:25:46.32 0.1 undecidable manual P 31 0.366 50 -0.17 92
IV.MIDA.HHZ. 2018-04-18T09:25:46.81 0.1 undecidable manual P 351 0.4146 50 -0.5 85
IV.MODR.HHZ. 2018-04-18T09:25:46.08 0.1 undecidable manual P 256 0.3588 50 -0.28 90
IV.SACR.HHN. 2018-04-18T09:25:45.86 0.1 undecidable manual P 59 0.3193 50 0.17 93
IV.PAOL.HHZ. 2018-04-18T09:25:44.16 0.1 undecidable manual P 140 0.2635 105 -0.32 91
IV.PIGN.HNZ. 2018-04-18T09:25:44.09 0.1 undecidable manual S 255 0.1259 120 0.1 98
IV.VITU.HHZ. 2018-04-18T09:25:43.56 0.1 undecidable manual P 103 0.223 108 -0.06 98
IV.VAGA.HHZ. 2018-04-18T09:25:42.53 0.1 undecidable manual P 336 0.1996 110 -0.61 86
IV.SGG.HHZ. 2018-04-18T09:25:41.97 0.3 undecidable manual P 10 0.1574 115 -0.28 71
IV.PIGN.HNZ. 2018-04-18T09:25:41.65 0.1 undecidable manual P 255 0.1259 120 0.02 100
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.CERA.HHE. ML:2 0.0002725 1.38 AML other m 2018-04-18T09:26:04.03
IV.SGG.HHE. ML:2.4 0.00225 1.56 AML other m 2018-04-18T09:25:46.84
IV.VAGA.HNE. ML:2.2 0.001144 0.52 AML other m 2018-04-18T09:25:48.20
IV.VAGA.HHE. ML:2.2 0.001205 0.52 AML other m 2018-04-18T09:25:48.20
IV.SGG.HHN. ML:2.3 0.001705 1.5 AML other m 2018-04-18T09:25:50.82
IV.SGG.HNN. ML:0 5.0E-9 1.48 AML other m 2018-04-18T09:25:50.82
IV.VITU.HHE. ML:2.3 0.00136 1.08 AML other m 2018-04-18T09:25:51.92
IV.VAGA.HHN. ML:2.6 0.00252 0.9 AML other m 2018-04-18T09:25:52.55
IV.VAGA.HNN. ML:2.5 0.00244 0.9 AML other m 2018-04-18T09:25:52.55
IV.PAOL.HNN. ML:2 0.00056 1.16 AML other m 2018-04-18T09:25:53.91
IV.MODR.HHN. ML:2 0.0003125 1.76 AML other m 2018-04-18T09:25:53.10
IV.MODR.HHE. ML:1.9 0.000265 0.24 AML other m 2018-04-18T09:25:53.87
IV.VITU.HNE. ML:1.9 0.000447 0.4 AML other m 2018-04-18T09:25:54.60
IV.PAOL.HHN. ML:2 0.0005565 1.08 AML other m 2018-04-18T09:25:54.33
IV.VITU.HHN. ML:2.3 0.00134 1.68 AML other m 2018-04-18T09:25:55.06
IV.VITU.HNN. ML:2.3 0.001335 0.76 AML other m 2018-04-18T09:25:55.07
IV.PAOL.HHE. ML:2 0.000542 0.36 AML other m 2018-04-18T09:25:55.26
IV.PAOL.HNE. ML:2 0.0004715 0.34 AML other m 2018-04-18T09:25:55.09
IV.BSSO.HNE. ML:1.9 0.0002745 0.92 AML other m 2018-04-18T09:25:56.13
IV.MIDA.HHN. ML:1.9 0.000215 0.38 AML other m 2018-04-18T09:25:56.51
IV.BSSO.HNN. ML:2.1 0.0003925 0.8 AML other m 2018-04-18T09:25:57.10
IV.BSSO.HHN. ML:1.7 0.000156 0.78 AML other m 2018-04-18T09:25:57.10
IV.MIDA.HHE. ML:2.1 0.00038 1.24 AML other m 2018-04-18T09:26:02.82
IV.MIDA.HNE. ML:2.1 0.0003785 1.26 AML other m 2018-04-18T09:26:02.83
IV.CERA.HNE. ML:2 0.000283 0.82 AML other m 2018-04-18T09:26:03.04
IV.CERA.HHN. ML:2 0.000293 0.62 AML other m 2018-04-18T09:26:05.20
IV.CERA.HNN. ML:2 0.000281 0.6 AML other m 2018-04-18T09:26:05.21
IV.BSSO.HHE. ML:1.5 0.0001175 1.26 AML other m 2018-04-18T09:26:09.12
IV.T1220.HNE. ML:3.1 0.000273 1.2 AML other m 2018-04-18T09:26:46.74
IV.PIGN.HHN. ML:2.2 0.0019809095 0.2432 AML other m 2018-04-18T09:25:45.40
IV.PIGN.HNN. ML:2.2 0.0019072915 0.2496 AML other m 2018-04-18T09:25:45.41
IV.PIGN.HNE. ML:2.5 0.0032116785 0.2432 AML other m 2018-04-18T09:25:44.31
IV.PIGN.HHE. ML:2.5 0.003275818 0.2432 AML other m 2018-04-18T09:25:44.31
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Focal Mechanisms

Focal Mechanisms

This map reports the focal mechanisms since 1977 in the region. The white and red beach ball symbols are mechanisms determined using the Regional Centroid Moment Tensor (RCMT, http://www.bo.ingv.it/RCMT) and are determined for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when there is a good source-receiver geometry of the target earthquake, the RCMT can be obtained also for earthquakes with magnitude larger than 4.0. The blue and white beach ball symbols indicate the mechanisms obtained from application of the Time Domain Moment Tensor (TDMT, http://cnt.rm.ingv.it/tdmt.html). This technique is used for M ≥ 3.5. The size of the beach ball sysmbol scales with the calculated moment magnitude, Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download
Waveforms Seismic signals in full SEED format Download