Earthquake with magnitude of Md 3.9 on date 11-04-1987 and time 04:26:24 (Italy) in region 2 km E Nemi (RM)

A magnitude Md 3.9 earthquake occured in region: 2 km E Nemi (RM), on

  • 11-04-1987 02:26:24 (UTC)
  • 11-04-1987 04:26:24 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7170, 12.7370 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.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Nemi RM 2 1943 1943
Genzano di Roma RM 4 23970 25913
Velletri RM 5 53303 79216
Lanuvio RM 5 13632 92848
Ariccia RM 6 19407 112255
Rocca di Papa RM 6 17034 129289
Albano Laziale RM 7 41715 171004
Castel Gandolfo RM 8 8997 180001
Lariano RM 8 13432 193433
Marino RM 9 43026 236459
Rocca Priora RM 9 11962 248421
Grottaferrata RM 10 20327 268748
Monte Compatri RM 10 11978 280726
Frascati RM 11 22087 302813
Monte Porzio Catone RM 11 8693 311506
San Cesareo RM 13 15153 326659
Colonna RM 13 4287 330946
Labico RM 15 6379 337325
Ciampino RM 15 38412 375737
Artena RM 15 14276 390013
Aprilia LT 15 73446 463459
Cisterna di Latina LT 16 36868 500327
Rocca Massima LT 16 1136 501463
Zagarolo RM 16 17843 519306
Valmontone RM 17 15959 535265
Cori LT 17 11065 546330
Gallicano nel Lazio RM 19 6334 552664
Palestrina RM 19 21672 574336
Castel San Pietro Romano RM 20 902 575238
Cave RM 20 11287 586525
Ardea RM 20 49183 635708

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km NW of Velletri (53303 inhabitants)
15 Km NE of Aprilia (73446 inhabitants)
20 Km E of Pomezia (62966 inhabitants)
28 Km S of Tivoli (56533 inhabitants)
29 Km SE of Roma (2864731 inhabitants)
31 Km NW of Latina (125985 inhabitants)
31 Km N of Anzio (54211 inhabitants)
32 Km S of Guidonia Montecelio (88673 inhabitants)
42 Km E of Fiumicino (78395 inhabitants)
89 Km E of Civitavecchia (52991 inhabitants)
89 Km SW of L'Aquila (69753 inhabitants)
94 Km SE of Viterbo (67173 inhabitants)
94 Km S of Terni (111501 inhabitants)
Recent and historical seismicity

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is 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
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
Md 3.9 1987-04-11
02:26:24
41.717 12.737 8 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 44569
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-04-11 02:26:24 ± 0.308
Latitude 41.7170 ± 0.0142
Longitude 12.7370 ± 0.0169
Depth (km) 8 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 44569

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 2111.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 108
Number of associated phases, regardless of their use for origin computation 78
Number of defining phases 78
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00081
Epicentral distance of station farthest from the epicenter (degree) 0.08054
Number of stations at which the event was observed 73
Number of stations from which data was used for origin computation 73
Magnitude information

Md:3.9

Field Value
Value 3.9
Uncertainty
Num. used stations 6
Type of magnitude Md
Reference to an origin 44569
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:44:00
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.MOX.Z. 1987-04-11T02:28:34.00 10.0 undecidable manual PN 355 8.9355 -0.12 1
--.LRG.Z. 1987-04-11T02:28:33.80 10.0 undecidable manual SN 292 4.995 -1 0.3
--.BGF.Z. 1987-04-11T02:28:29.40 10.0 undecidable manual PN 307 8.5692 0.42 0.9
--.LOR.Z. 1987-04-11T02:28:27.00 10.0 undecidable manual PN 314 8.4027 0.34 1
--.CAF.Z. 1987-04-11T02:28:25.80 10.0 undecidable manual PN 296 8.3805 -0.55 0.9
--.LBF.Z. 1987-04-11T02:28:24.20 10.0 undecidable manual PN 313 8.1696 0.8 0.7
--.SMF.Z. 1987-04-11T02:28:22.40 10.0 undecidable manual PN 310 8.0364 0.68 0.8
--.SBF.Z. 1987-04-11T02:28:21.20 10.0 undecidable manual SN 300 4.4289 -0.24 0.6
--.CDF.Z. 1987-04-11T02:28:17.10 10.0 undecidable manual PN 332 7.7145 -0.05 1.1
--.HAU.Z. 1987-04-11T02:28:17.40 10.0 undecidable manual PN 326 7.7256 -0.06 1.1
--.BSF.Z. 1987-04-11T02:28:12.60 10.0 undecidable manual PN 327 7.4148 -0.47 1
--.SLE.Z. 1987-04-11T02:28:03.90 10.0 undecidable manual PN 335 6.7377 0.03 1.2
--.KBN.Z. 1987-04-11T02:27:56.20 10.0 undecidable manual PN 97 6.1383 0.65 1
--.SAX.Z. 1987-04-11T02:27:55.90 10.0 undecidable manual PN 337 6.0273 1.88 0.1
--.LLS.Z. 1987-04-11T02:27:51.80 10.0 undecidable manual PN 333 5.772 1.29 0.4
--.LPG.Z. 1987-04-11T02:27:51.60 10.0 undecidable manual PN 313 5.7387 1.55 0.3
--.BNI.Z. 1987-04-11T02:27:47.50 10.0 undecidable manual PN 309 5.5056 0.58 1.1
--.CVF.Z. 1987-04-11T02:27:47.10 10.0 undecidable manual SN 287 2.9859 0.16 0.6
--.OSS.Z. 1987-04-11T02:27:45.60 10.0 undecidable manual PN 340 5.2947 1.65 0.2
--.KBA.Z. 1987-04-11T02:27:45.00 10.0 undecidable manual PN 4 5.3613 0.05 1.4
--.TIR.Z. 1987-04-11T02:27:45.50 10.0 undecidable manual PN 91 5.3391 1 0.7
--.RRL.Z. 1987-04-11T02:27:45.00 10.0 undecidable manual PN 308 5.3724 -0.05 1.4
--.ORO.Z. 1987-04-11T02:27:43.00 10.0 undecidable manual PN 320 5.1948 0.4 1.3
--.TMA.Z. 1987-04-11T02:27:43.10 10.0 undecidable manual PN 328 5.1837 0.64 1.1
--.SDA.Z. 1987-04-11T02:27:41.00 10.0 undecidable manual PN 84 5.0283 0.65 1.1
--.ORX.Z. 1987-04-11T02:27:41.00 10.0 undecidable manual PN 320 5.2059 -1.65 0.2
--.VAI.Z. 1987-04-11T02:27:40.00 10.0 undecidable manual PN 326 5.0283 -0.32 1.4
--.TTG.Z. 1987-04-11T02:27:39.00 10.0 undecidable manual PN 79 4.884 0.7 1.1
--.DA9.Z. 1987-04-11T02:27:38.50 10.0 undecidable manual PN 306 4.8729 0.37 1.4
--.LRG.Z. 1987-04-11T02:27:38.90 10.0 undecidable manual PN 292 4.995 -0.93 0.8
--.FOI.Z. 1987-04-11T02:27:38.50 10.0 undecidable manual PN 0 4.8618 0.43 1.3
--.SOO.Z. 1987-04-11T02:27:38.60 10.0 undecidable manual PN 306 4.9617 -0.73 1
--.MEU.Z. 1987-04-11T02:27:38.50 10.0 undecidable manual PN 159 4.8729 0.36 1.4
--.RBL.Z. 1987-04-11T02:27:36.00 10.0 undecidable manual PN 6 4.7508 -0.48 1.3
--.STV.Z. 1987-04-11T02:27:35.30 10.0 undecidable manual PN 304 4.6842 -0.3 1.4
--.MDI.Z. 1987-04-11T02:27:35.00 10.0 undecidable manual PN 332 4.5954 0.58 1.2
--.SO9.Z. 1987-04-11T02:27:33.00 10.0 undecidable manual PN 144 4.44 0.84 1
--.LJU.Z. 1987-04-11T02:27:33.00 10.0 undecidable manual PN 15 4.5066 -0.1 1.6
--.HCY.Z. 1987-04-11T02:27:31.40 10.0 undecidable manual PN 78 4.3179 0.73 1.1
--.VOY.Z. 1987-04-11T02:27:31.20 10.0 undecidable manual PN 10 4.3845 -0.25 1.5
--.SBF.Z. 1987-04-11T02:27:31.00 10.0 undecidable manual PN 300 4.4289 -1.11 0.7
--.CTI.Z. 1987-04-11T02:27:31.00 10.0 undecidable manual PN 350 4.3956 -0.54 1.3
--.SAL.Z. 1987-04-11T02:27:30.00 10.0 undecidable manual PN 338 4.1958 1.13 0.6
--.LCI.Z. 1987-04-11T02:27:30.00 10.0 undecidable manual PN 107 4.2735 0.06 1.6
--.PGD.Z. 1987-04-11T02:27:30.00 10.0 undecidable manual SN 341 2.2755 -0.12 0.6
--.ROB.Z. 1987-04-11T02:27:30.70 10.0 undecidable manual PN 307 4.3845 -0.78 1
--.CEY.Z. 1987-04-11T02:27:29.50 10.0 undecidable manual PN 16 4.1958 0.68 1.2
--.CKI.Z. 1987-04-11T02:27:28.00 10.0 undecidable manual PN 311 4.218 -1.22 0.6
--.FIN.Z. 1987-04-11T02:27:27.20 10.0 undecidable manual PN 308 4.1292 -0.83 1
--.GR9.Z. 1987-04-11T02:27:27.00 10.0 undecidable manual PN 134 4.0293 0.36 1.4
--.IMP.Z. 1987-04-11T02:27:27.20 10.0 undecidable manual PN 303 4.1736 -1.28 0.5
--.CVT.Z. 1987-04-11T02:27:26.50 10.0 undecidable manual PN 179 4.0293 -0.08 1.6
--.CO9.Z. 1987-04-11T02:27:26.00 10.0 undecidable manual PN 322 3.8628 1.63 0.2
--.VEA.Z. 1987-04-11T02:27:26.50 10.0 undecidable manual PN 325 3.8961 1.83 0.1
--.TRI.Z. 1987-04-11T02:27:25.90 10.0 undecidable manual PN 10 4.0515 -0.96 0.8
--.BVT.Z. 1987-04-11T02:27:19.40 10.0 undecidable manual PN 323 3.4743 0.42 1.4
--.TS9.Z. 1987-04-11T02:27:19.00 10.0 undecidable manual PN 125 3.4077 0.94 0.9
--.BRT.Z. 1987-04-11T02:27:17.00 10.0 undecidable manual PN 102 3.4188 -1.08 0.7
--.BAI.Z. 1987-04-11T02:27:13.50 10.0 undecidable manual PN 99 3.1524 -1.09 0.7
--.CVF.Z. 1987-04-11T02:27:10.80 10.0 undecidable manual PN 287 2.9859 -1.39 0.4
--.BDI.Z. 1987-04-11T02:27:10.00 10.0 undecidable manual PN 326 2.8083 0.14 1.6
--.CDM.Z. 1987-04-11T02:27:08.00 10.0 undecidable manual PN 102 2.7195 -0.59 1.2
--.PGD.Z. 1987-04-11T02:27:02.00 10.0 undecidable manual PN 341 2.2755 -0.48 1.3
--.MG9.Z. 1987-04-11T02:27:07.00 10.0 undecidable manual PN 125 2.6418 -0.53 1.3
--.PS9.Z. 1987-04-11T02:27:06.00 10.0 undecidable manual PN 321 2.5752 -0.56 1.3
--.FIR.Z. 1987-04-11T02:27:04.00 10.0 undecidable manual PN 332 2.3199 0.92 0.9
--.SGO.Z. 1987-04-11T02:27:01.50 10.0 undecidable manual PN 120 2.2422 -0.61 1.2
--.AM8.Z. 1987-04-11T02:26:58.95 10.0 undecidable manual PN 18 1.9314 1.19 0.6
--.CRE.Z. 1987-04-11T02:26:57.50 10.0 undecidable manual PN 343 1.9758 -0.94 0.9
--.ARV.Z. 1987-04-11T02:26:55.50 10.0 undecidable manual PN 4 1.776 -0.19 1.5
--.CM8.Z. 1987-04-11T02:26:51.56 10.0 undecidable manual PN 11 1.4985 -0.29 1.5
--.ASS.Z. 1987-04-11T02:26:49.00 10.0 undecidable manual PN 357 1.3431 -0.64 2.4
--.DUI.Z. 1987-04-11T02:26:48.00 10.0 undecidable manual PN 91 1.2765 -0.81 1
--.MAO.Z. 1987-04-11T02:26:47.80 10.0 negative manual PN! 301 1.3653 -2.13 0
--.AQU.Z. 1987-04-11T02:26:39.50 10.0 undecidable manual PG 37 0.7992 -1.53 0.6
--.SD1.Z. 1987-04-11T02:26:38.50 10.0 negative manual PG! 90 0.7992 -2.44 0
--.RMP.Z. 1987-04-11T02:26:27.50 10.0 positive manual PG 344 0.0888 0.14 3.1
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, /tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols 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