Aftershock sequence of the 9 May 1989 Canary Islands earthquake

Jiménez, M. J.; Garcı́a-Fernández, Mariano

doi:10.1016/0040-1951(95)00179-4

Cited by 12 publications

(4 citation statements)

References 15 publications

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“…5a; Le Bas et al 2005). These additional observations, along with the seismically corroborated acoustic event location away from previously known seismic sources, suggests that future volcanic activity in the northern island chain may occur, though other origins are possible, such as edifice instability (Day et al 1999), hydrothermal activity (Jiménez & Garciá‐Fernández 1996), or plate flexure due to edifice loading (ten Brink & Brocher 1987).…”

Section: Resultsmentioning

confidence: 76%

Hydroacoustic detection of volcanic ocean-island earthquakes

Helffrich

Heleno²,

Faria

et al. 2006

Geophysical Journal International

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S U M M A R YReal-time monitoring of volcanic earthquakes forms a critical component of assessing volcanic hazard but requires a widely dispersed land-based instrument network and analysis infrastructure to be effective. Here we show how a sparse network of hydrophones can be used for volcano monitoring as well. Detection of acoustic events by the Mid-Atlantic Ridge hydrophone array includes many events in the vicinity of the Cape Verde Islands, upon which a volcano monitoring network operates. Correlating the hydroacoustic events with earthquake locations determined by the network, we find that earthquakes of magnitudes as low as ML 2.0 can be hydroacoustically located to ±25 km at ranges up to 2000 km. All correlatable events are volcano-tectonic in character. Acoustic propagation of small-magnitude earthquake signals is more efficient if their sources are perched in the island's volcanic edifice in the ocean sound transmission channel, which contributes to volcanic event detectability. The location accuracy at this low magnitude range, which includes magnitudes typical of seismic crises precursory to eruptions, provides an additional volcanic hazard monitoring capability. Seismicity and hydroacoustic activity in the northern Cape Verdes suggest that this monitoring element may be of use in assessing future risk there.

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Section: Resultsmentioning

confidence: 76%

Hydroacoustic detection of volcanic ocean-island earthquakes

Helffrich

Heleno²,

Faria

et al. 2006

Geophysical Journal International

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“…In the Canary Islands only a fault located between Gran Canaria and Tenerife Islands (Figure 1), with a NE-SW direction, has been identified [27] as being able to generate big earthquakes. This fault, first inferred from seismic and gravity data by [27], was identified as the source of the 9 May 1989 [27][28][29], the largest earthquake (mbLg 5.2) recorded in the Canary Islands during the instrumental period. Mantovani et al [30] proposed the existence of the Morocco microplate whose southern boundary coincides with the location of this left-lateral strike-slip fault.…”

Section: Geodynamic Settingmentioning

confidence: 95%

A Review on Historical Tsunamis in the Canary Islands: Implications for Tsunami Risk Reduction

et al. 2021

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The analysis of the historical documentary sources together with evidence from the geological record is essential to understand the impact and processes triggered by tsunamis on the Canary Islands. This archipelago has been affected by tsunamis caused by different geological processes, of which the most studied have been those generated by prehistoric mega-landslides. However, there is also evidence of those produced by distant tsunamigenic sources. An exhaustive review of all documentation available was made, identifying the existence of at least four seismically triggered tsunami episodes (1755, 1761, 1941 and 1969), the majority with an epicenter in the Azores-Gibraltar boundary. In this work, several tsunamis are cited for the first time, such as the one produced by the Argaga (La Gomera) landslide in 2020. Other episodes historically identified as tsunamis are discarded as they corresponded to other geological events. The effects of most historic tsunamis have gone unnoticed, having occurred in epochs of sparsely populated coastal areas. But their study allows us to infer the need for the archipelago authorities to establish preventive measures to avoid possible damage from tsunamis, especially if we consider the presently high population density of the Canarian littoral.

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“…Overall, the level of historically recorded seismic activity is low in the Canary Islands region and mostly concentrated on the island of Tenerife and between the two main islands, Tenerife and Gran Canaria (Mezcua et al 1992, Jiménez andFernández 1996). The remaining historical records (Monge 1980) relate to: a few isolated deep earthquakes, with small magnitude, slightly felt over the whole area, outside the eruptive periods; seismic swarms with some strong shallow shocks (up to felt intensity VIII on the MMI scale), associated with eruptions in a number of cases - Tenerife 1909, La Palma 1949, 1971, but not in others -Fuerteventura 1915, La Palma 1936, 1939.…”

Section: Historical Seismicitymentioning

confidence: 97%

“…This proximity, complexities in the age sequence of volcanism in the islands, explained in terms of a plume by Carracedo et al (1998), and the lack of a clear geophysical plume signature led to the suggestion (Anguita and Hernán 1975) that the Canaries were formed by movement of melts up a propagating fracture system extending west from the Atlas; and that the Canaries were therefore a plate margin volcanism associated with active re- gional-scale deformation. This and similar models (Araña and Ortiz 1991) have been used to interpret a major earthquake in 1989 between the islands of Tenerife and Gran Canaria (Mezcua et al 1992, Jiménez andFernández 1996) as being of regional tectonic origin. Teleseismic records for the African plate sector of the Atlantic Ocean as a whole led Wysession et al (1995) to conclude that the seismic activity in this sector is concentrated around the Canaries and Cape Verde islands (Fig.…”

Section: Introduction -The Canaries Hot Spot and Active Deformationmentioning

confidence: 98%

Magma intrusion as a driving mechanism for the seismic clustering following the 9 May 1989 earthquake swarms at the Canary Islands

Vinciguerra

Day

2013

Acta Geophys.

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A b s t r a c t On 9 May 1989 a M L = 5.2 earthquake struck a region between the islands of Tenerife and Gran Canaria. We investigated the time-spatial evolution of seismic patterns affecting the Canary Islands region during 1989-1995, using a quantitative spatial fractal analysis method. This method allows quantitative investigation of subtle trends in seismicity distribution through time. The fractal analysis indicates that epicenters clustered around a large zone during the May 1989 sequence affected narrow zones during 1991-1993, but then larger zones during 1993-1995 with an overall trend to shallower focal depths. The spatial localisation of seismic data and its time evolution appear to be related to magmatic rather than tectonic activity. Spatial clustering properties of seismicity are consistent with a major intrusive episode in 1989, followed by a period of quiescence and renewed deep intrusive activity from 1993 onwards. This interpretation suggests an increasing probability of future volcanic hazard in the region investigated.

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Aftershock sequence of the 9 May 1989 Canary Islands earthquake

Cited by 12 publications

References 15 publications

Hydroacoustic detection of volcanic ocean-island earthquakes

Hydroacoustic detection of volcanic ocean-island earthquakes

A Review on Historical Tsunamis in the Canary Islands: Implications for Tsunami Risk Reduction

Magma intrusion as a driving mechanism for the seismic clustering following the 9 May 1989 earthquake swarms at the Canary Islands

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